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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ANT-2026-N0ZPQQQ6 | https://red.anthropic.com/2026/cvd/findings/ANT-2026-N0ZPQQQ6 | ffmpeg/ffmpeg | heap-buffer-overflow | high | high | high | - | Claude Mythos Preview | [] | [] | fastaudio.c:171 | ANT-2026-N0ZPQQQ6: The ASAN report describes a real, plausible heap-buffer-overflow in ffmpeg's fastaudio decoder at line 171 of fastaudio.c. | A fuzzed input to FFmpeg's FastAudio codec (ffmpeg_AV_CODEC_ID_FASTAUDIO_fuzzer) triggers a heap-buffer-overflow on a WRITE operation at fastaudio.c:171. The decoder writes past the bounds of a heap allocation while processing attacker-controlled audio packet data. Because FFmpeg decoders operate on untrusted media inp... | ASAN reports a heap-buffer-overflow WRITE at fastaudio.c:171 in the FastAudio decoder. The decoder writes decoded samples beyond the end of a heap-allocated buffer, indicating a missing or incorrect bounds check on the output/index computation relative to the allocated size.
Crash signature:
ASAN heap-buffer-overflow ... | Craft a malformed FastAudio bitstream that drives the decode loop past the output buffer bounds
Wrap it in a container (or raw packet) that routes to AV_CODEC_ID_FASTAUDIO
Deliver the file/stream to the target so libavcodec decodes it
Out-of-bounds heap write occurs at fastaudio.c:171
[No reproducer or sanitizer outpu... | This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic security team in collaboration with Anthropic Research. Please direct questions to security-cvd@anthropic.com and reference ANT-2026-N0ZPQQQ6.
Reference:
ANT-2026-N0ZPQQQ6
Anthropic CVD Policy:
https://www.anthropic.com... | ANT-2026-N0ZPQQQ6: The ASAN report describes a real, plausible heap-buffer-overflow in ffmpeg's fastaudio decoder at line 171 of fastaudio.c.
A fuzzed input to FFmpeg's FastAudio codec (ffmpeg_AV_CODEC_ID_FASTAUDIO_fuzzer) triggers a heap-buffer-overflow on a WRITE operation at fastaudio.c:171. The decoder writes past ... | Ada Logics | true positive | diff --git a/libavcodec/fastaudio.c b/libavcodec/fastaudio.c
index d361b410b9ecc..bab3cb738b921 100644
--- a/libavcodec/fastaudio.c
+++ b/libavcodec/fastaudio.c
@@ -113,6 +113,8 @@ static int fastaudio_decode(AVCodecContext *avctx, AVFrame *frame,
int ret;
subframes = pkt->size / (40 * avctx->ch_layout.nb_channels);
+ ... | # ANT-2026-N0ZPQQQ6: ANT-2026-N0ZPQQQ6 Β· ffmpeg/ffmpeg
**Project:** ffmpeg/ffmpeg | **Bug Class:** heap-buffer-overflow
**Attributed Model:** Claude Mythos Preview | **Claude Severity:** high | **Maintainer Severity:** -
## Vulnerability Summary
A fuzzed input to FFmpeg's FastAudio codec (ffmpeg_AV_CODEC_ID_FASTAUDIO_f... | <!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ANT-2026-N0ZPQQQ6 Β· ffmpeg/ffmpeg</title>
<link rel="icon" type="image/x-icon" href="/anthropic-serve/favicon.ico">
<script>(function(){try{var t=localStorage.getItem("cvd_theme");i... | fixed | true | 2026-03-27 | 2026-05-28 | cb1bed514d82d5b20d7bee3807f6f890cd332e425a6e1e136b2f2dec0e50b908c22eb33d799560978daa374ec4a7b1f07c316cebcb7693a6006f0ee5a8a5bbb6 | 429 | 168 | 584 | 3,938 | 752 | ||
ANT-2026-RXSADDFE | https://red.anthropic.com/2026/cvd/findings/ANT-2026-RXSADDFE | ffmpeg/ffmpeg | heap-buffer-overflow | high | high | high | - | Claude Mythos Preview | [] | [] | g2meet.c:486 | ANT-2026-RXSADDFE: Heap-buffer-overflow in g2meet.c:486 | While decoding a crafted G2M (GoToMeeting) frame, epic_decode_tile() invokes epic_decode_run_length(), which calls is_pixel_on_stack() at g2meet.c:486. That function performs a 4-byte read immediately past the end of a 10912-byte heap buffer that was allocated as the codec's private context via avcodec_alloc_context3()... | ASAN: "READ of size 4 at 0x78b6b98e2ba0 ... 0 bytes after 10912-byte region". The ePIC run-length path indexes the decoder's pixel stack without ensuring the index stays within the private-data allocation, so is_pixel_on_stack() dereferences one 32-bit element past the end of the buffer. The missing bound check on the ... | Craft a G2M bitstream containing an ePIC/JB tile whose run-length data drives the pixel-stack index out of range
Deliver the file/stream to the victim (e.g., upload, media message, transcoding pipeline)
Victim calls avcodec_send_packet(); g2m_decode_frame β epic_decode_tile β epic_decode_run_length β is_pixel_on_stack ... | This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic security team in collaboration with Anthropic Research. Please direct questions to security-cvd@anthropic.com and reference ANT-2026-RXSADDFE.
Reference:
ANT-2026-RXSADDFE
Anthropic CVD Policy:
https://www.anthropic.com... | ANT-2026-RXSADDFE: Heap-buffer-overflow in g2meet.c:486
While decoding a crafted G2M (GoToMeeting) frame, epic_decode_tile() invokes epic_decode_run_length(), which calls is_pixel_on_stack() at g2meet.c:486. That function performs a 4-byte read immediately past the end of a 10912-byte heap buffer that was allocated as ... | Ada Logics | true positive | # ANT-2026-RXSADDFE: ANT-2026-RXSADDFE Β· ffmpeg/ffmpeg
**Project:** ffmpeg/ffmpeg | **Bug Class:** heap-buffer-overflow
**Attributed Model:** Claude Mythos Preview | **Claude Severity:** high | **Maintainer Severity:** -
## Vulnerability Summary
While decoding a crafted G2M (GoToMeeting) frame, epic_decode_tile() invok... | <!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ANT-2026-RXSADDFE Β· ffmpeg/ffmpeg</title>
<link rel="icon" type="image/x-icon" href="/anthropic-serve/favicon.ico">
<script>(function(){try{var t=localStorage.getItem("cvd_theme");i... | fixed | true | 2026-03-24 | 2026-05-13 | a56ab0d1ce61e11f2549a86f99f831a877d2f40b16e04ddca6c2ffc3c01e10c8e88b97985e4f79df488cde2daf884efbc40dddd8feeda1e21e96f9e569bb30f6 | 986 | 0 | 980 | 4,222 | 980 | |||
ANT-2026-C6E98TYX | https://red.anthropic.com/2026/cvd/findings/ANT-2026-C6E98TYX | liboqs | other | high | high | high | - | Claude Mythos Preview | [] | [
"GHSA-jr5q-r9qx-v738"
] | src/kem/kem.c:645 (OQS_KEM_encaps_derand); src/kem/ntru/kem_ntru_*.c:11 (six constructors) | ANT-2026-C6E98TYX: 01-liboqs-ntru-uninit-fn-ptr | The NTRU constructors in src/kem/ntru/kem_ntru_.c call OQS_MEM_malloc(sizeof(OQS_KEM)) and assign twelve struct fields but omit encaps_derand at offset 88, leaving it with stale heap residue. The public API OQS_KEM_encaps_derand() at kem.c:645 checks only that kem != NULL before tail-jumping through kem->encaps_derand ... | ASAN: "SEGV on unknown address ... caused by a READ memory access ... dereference of a high value address" at kem.c:645 β the 0xbe poison pattern in encaps_derand proves the field was never written post-allocation. Root cause is a code-generation template gap: 33 of 39 KEM constructors set encaps_derand, but the six NT... | Allocate 112-byte chunks and write the desired jump target (e.g., &system) at offset 88 of each
Free the chunks so they populate glibc's 112-byte tcache freelist (LIFO)
Call OQS_KEM_new(OQS_KEM_alg_ntru_hps2048509) β constructor reclaims a groomed chunk via OQS_MEM_malloc and writes fields 0β87 and 96β111, leaving offs... | This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic security team in collaboration with Anthropic Research. Please direct questions to security-cvd@anthropic.com and reference ANT-2026-C6E98TYX.
Reference:
ANT-2026-C6E98TYX
Anthropic CVD Policy:
https://www.anthropic.com... | ANT-2026-C6E98TYX: 01-liboqs-ntru-uninit-fn-ptr
The NTRU constructors in src/kem/ntru/kem_ntru_
.c call OQS_MEM_malloc(sizeof(OQS_KEM)) and assign twelve struct fields but omit encaps_derand at offset 88, leaving it with stale heap residue. The public API OQS_KEM_encaps_derand() at kem.c:645 checks only that kem != NUL... | Ada Logics | true positive | # ANT-2026-C6E98TYX: ANT-2026-C6E98TYX Β· liboqs
**Project:** liboqs | **Bug Class:** other
**Attributed Model:** Claude Mythos Preview | **Claude Severity:** high | **Maintainer Severity:** -
**Security Advisories:** GHSA-jr5q-r9qx-v738
## Vulnerability Summary
The NTRU constructors in src/kem/ntru/kem_ntru_.c call OQS... | <!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ANT-2026-C6E98TYX Β· liboqs</title>
<link rel="icon" type="image/x-icon" href="/anthropic-serve/favicon.ico">
<script>(function(){try{var t=localStorage.getItem("cvd_theme");if(t==="... | fixed | true | 2026-04-01 | 2026-05-07 | 036d8ef5dc823244713d07925545a3daa8e7f2b0dcb640d5e603e0b5af1ee56b0006b0a2cc12123774a58528d66c64171413eaaa9c6d62df3ede3fc27b30d600 | 1,007 | 0 | 990 | 5,017 | 990 | |||
ANT-2026-49KSKQPG | https://red.anthropic.com/2026/cvd/findings/ANT-2026-49KSKQPG | selinux | heap-buffer-overflow | low | low | low | - | Claude Mythos Preview | [] | [] | map_ebitmap() | static analysis β not yet dynamically reproduced | ANT-2026-49KSKQPG: Heap buffer overflow in libsepol map_ebitmap() via unbounded ebitmap index used as array index | An unbounded ebitmap index is used directly as an array index in map_ebitmap(), leading to a heap buffer overflow. | This finding was identified by static analysis and has not yet been dynamically reproduced. A trigger input is not included.
[No reproducer or sanitizer output attached β request from security-cvd@anthropic.com if needed.] | This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic security team in collaboration with Anthropic Research. Please direct questions to security-cvd@anthropic.com and reference ANT-2026-49KSKQPG.
Reference:
ANT-2026-49KSKQPG
Anthropic CVD Policy:
https://www.anthropic.com... | ANT-2026-49KSKQPG: Heap buffer overflow in libsepol map_ebitmap() via unbounded ebitmap index used as array index
An unbounded ebitmap index is used directly as an array index in map_ebitmap(), leading to a heap buffer overflow.
Target
Project:
selinux
Location:
map_ebitmap()
Discovery:
static analysis β not yet dynami... | Trail of Bits | true positive | # ANT-2026-49KSKQPG: ANT-2026-49KSKQPG Β· selinux
**Project:** selinux | **Bug Class:** heap-buffer-overflow
**Attributed Model:** Claude Mythos Preview | **Claude Severity:** low | **Maintainer Severity:** -
## Vulnerability Summary
An unbounded ebitmap index is used directly as an array index in map_ebitmap(), leading... | <!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ANT-2026-49KSKQPG Β· selinux</title>
<link rel="icon" type="image/x-icon" href="/anthropic-serve/favicon.ico">
<script>(function(){try{var t=localStorage.getItem("cvd_theme");if(t===... | fixed | true | 2026-03-29 | 2026-04-09 | b3bddfd71dbcc31e16e651882b499a41d01609d2b807be15901830163ff0f23eb2e15b1d4187cfc9194adcf034a63557bc348c4775f8006d836f54eb7a0d41c2 | 217 | 0 | 202 | 2,449 | 202 | |||
ANT-2026-VV0PRKKV | https://red.anthropic.com/2026/cvd/findings/ANT-2026-VV0PRKKV | wolfssl/wolfssl | heap-buffer-overflow | medium | high | medium | medium | Claude Mythos Preview | [
"CVE-2026-5447"
] | [
"GHSA-mx4j-fjqx-f8qj"
] | src/x509.c:CertFromX509() | ANT-2026-VV0PRKKV: wolfSSL: heap buffer overflow in CertFromX509() from AuthorityKeyIdentifier size mismatch | In wolfSSL's OpenSSL-compatibility layer, CertFromX509() in src/x509.c converts a parsed certificate back into a Cert structure for re-encoding. When WOLFSSL_AKID_NAME is enabled, it bounds-checked only the AuthorityKeyIdentifier keyIdentifier length (authKeyIdSz) against the fixed-size cert->akid buffer but then copie... | Root cause.
CertFromX509()
(
src/x509.c
) copies the AuthorityKeyIdentifier (AKID) from a
WOLFSSL_X509
into the fixed-size
akid[]
array of a
Cert
structure that is heap-allocated during DER generation. Before the fix, the guard and the copy used different lengths:
if (x509->authKeyIdSz < sizeof(cert->akid)) {
#ifdef W... | Reproduce against the target as described under Technical Details.
[No reproducer or sanitizer output attached β request from security-cvd@anthropic.com if needed.] | This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic security team in collaboration with Anthropic Research. Please direct questions to security-cvd@anthropic.com and reference ANT-2026-VV0PRKKV.
Reference:
ANT-2026-VV0PRKKV
Anthropic CVD Policy:
https://www.anthropic.com... | ANT-2026-VV0PRKKV: wolfSSL: heap buffer overflow in CertFromX509() from AuthorityKeyIdentifier size mismatch
In wolfSSL's OpenSSL-compatibility layer, CertFromX509() in src/x509.c converts a parsed certificate back into a Cert structure for re-encoding. When WOLFSSL_AKID_NAME is enabled, it bounds-checked only the Auth... | Calif | true positive | diff --git a/src/x509.c b/src/x509.c
index 3593cd82f47..f4006ffe3ac 100644
--- a/src/x509.c
+++ b/src/x509.c
@@ -11870,25 +11870,28 @@ static int CertFromX509(Cert* cert, WOLFSSL_X509* x509)
return WOLFSSL_FAILURE;
}
- if (x509->authKeyIdSz < sizeof(cert->akid)) {
#ifdef WOLFSSL_AKID_NAME
- cert->rawAkid = 0;... | # ANT-2026-VV0PRKKV: ANT-2026-VV0PRKKV Β· wolfssl/wolfssl
**Project:** wolfssl/wolfssl | **Bug Class:** heap-buffer-overflow
**Attributed Model:** Claude Mythos Preview | **Claude Severity:** high | **Maintainer Severity:** medium
**Security Advisories:** CVE-2026-5447, GHSA-mx4j-fjqx-f8qj
## Vulnerability Summary
In wo... | <!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ANT-2026-VV0PRKKV Β· wolfssl/wolfssl</title>
<link rel="icon" type="image/x-icon" href="/anthropic-serve/favicon.ico">
<script>(function(){try{var t=localStorage.getItem("cvd_theme")... | fixed | true | 2026-03-27 | 2026-03-27 | 1bab7d8c0711e693bd53c3eec2b556b1ba8709ea1e4f3b0719a15ee8eaa70c89eeec4797e90b5ab922b7b8935bd6636effceefe31a976be0d557537919daab7d | 1,275 | 2,642 | 3,943 | 8,695 | 6,585 | ||
ANT-2026-XQVPKKPB | https://red.anthropic.com/2026/cvd/findings/ANT-2026-XQVPKKPB | freerdp/freerdp | double-free | high | high | high | - | Claude Mythos Preview | [
"CVE-2026-64621"
] | [
"GHSA-f27x-frr8-j9hc"
] | client/common/file.c:2536 | static analysis β not yet dynamically reproduced | ANT-2026-XQVPKKPB: Double-free of MonitorIds when parsing malformed selectedmonitors | "In client/common/file.c, freerdp_client_rdp_file_apply_to_settings() obtains a raw (non-copied) poi(...TRUNCATED) | "freerdp_settings_get_pointer_writable() returns the raw settings->MonitorIds pointer (settings_gett(...TRUNCATED) | "Craft a .rdp file containing e.g.\nselectedmonitors:s:99999999999999999999999\n(optionally preceded(...TRUNCATED) | "This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic(...TRUNCATED) | "ANT-2026-XQVPKKPB: Double-free of MonitorIds when parsing malformed selectedmonitors\nIn client/com(...TRUNCATED) | Ada Logics | true positive | "diff --git a/client/common/file.c b/client/common/file.c\nindex dc8af42fb1ba..dcd17899de0a 100644\n(...TRUNCATED) | "# ANT-2026-XQVPKKPB: ANT-2026-XQVPKKPB Β· freerdp/freerdp\n**Project:** freerdp/freerdp | **Bug Cla(...TRUNCATED) | "<!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" cont(...TRUNCATED) | disclosed | true | 2026-04-02 | 2026-07-22 | "3a90d073b15799d00f35445781c7d4cf2389ac6ed3dd751727e154c08ea2410bce55fabefc0ad71899fc5da0bcae17903a0(...TRUNCATED) | 775 | 121 | 871 | 9,968 | 992 | |
ANT-2026-WQ7HHBE1 | https://red.anthropic.com/2026/cvd/findings/ANT-2026-WQ7HHBE1 | supabase/postgres | other | low | low | - | - | Claude Mythos Preview | [] | [] | ansible/files/postgresql_config/supautils.conf.j2:14 | static analysis β not yet dynamically reproduced | ANT-2026-WQ7HHBE1: Internal admin roles omitted from supautils reserved lists | "The supautils config template lists roles the customer-facing postgres user is forbidden from touch(...TRUNCATED) | "The reserved_roles (line 15) and reserved_memberships (line 14) allow-lists are incomplete: supabas(...TRUNCATED) | "Connect to the project database as the customer postgres role (has CREATEROLE).\nRun ALTER ROLE sup(...TRUNCATED) | "This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic(...TRUNCATED) | "ANT-2026-WQ7HHBE1: Internal admin roles omitted from supautils reserved lists\nThe supautils config(...TRUNCATED) | "diff --git a/ansible/files/postgresql_config/supautils.conf.j2 b/ansible/files/postgresql_config/su(...TRUNCATED) | "# ANT-2026-WQ7HHBE1: ANT-2026-WQ7HHBE1 Β· supabase/postgres\n**Project:** supabase/postgres | **Bug(...TRUNCATED) | "<!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" cont(...TRUNCATED) | disclosed | true | 2026-05-10 | 2026-05-18 | "e047a349b01e4db4382e7004ba1ba6f36db8f1d2c252001eb1f13379db23d1ac587e1ebb98ec4d3195ea1e9de0150a264c0(...TRUNCATED) | 562 | 933 | 1,421 | 5,446 | 2,354 | |||
ANT-2026-CJQWKW82 | https://red.anthropic.com/2026/cvd/findings/ANT-2026-CJQWKW82 | postgres/postgres | denial-of-service | high | high | high | high | Claude Opus 4.6 | [
"CVE-2026-6479"
] | [
"GHSA-hwfh-mh4f-m67f"
] | 5241616289cc64e0 | src/backend/tcop/backend_startup.c:637 | static analysis β not yet dynamically reproduced | "ANT-2026-CJQWKW82: Pre-auth unbounded recursion in ProcessStartupPacket: alternating SSL/GSS negoti(...TRUNCATED) | "Unauthenticated attacker alternates SSL and GSS request packets. After ~40K-80K exchanges the backe(...TRUNCATED) | "When SSL is rejected, line 637 recurses with ProcessStartupPacket(port, true, SSLok == 'S') β (tr(...TRUNCATED) | "This finding was identified by static analysis and has not yet been dynamically reproduced. The Tec(...TRUNCATED) | "This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic(...TRUNCATED) | "ANT-2026-CJQWKW82: Pre-auth unbounded recursion in ProcessStartupPacket: alternating SSL/GSS negoti(...TRUNCATED) | Calif | true positive | "diff --git a/src/backend/tcop/backend_startup.c b/src/backend/tcop/backend_startup.c\nindex 5abf276(...TRUNCATED) | "# ANT-2026-CJQWKW82: ANT-2026-CJQWKW82 Β· postgres/postgres\n**Project:** postgres/postgres | **Bug(...TRUNCATED) | "<!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" cont(...TRUNCATED) | fixed | true | 2026-04-02 | 2026-05-08 | "6ccb97193bc23f5185d8846690778b6b553b97c7a27eff1ae8a5e80c0f404193c5d139372722332faa52572e486f6d05122(...TRUNCATED) | 418 | 1,442 | 1,858 | 6,692 | 3,300 |
ANT-2026-RXYVE4DZ | https://red.anthropic.com/2026/cvd/findings/ANT-2026-RXYVE4DZ | freerdp/freerdp | heap-buffer-overflow | critical | critical | critical | - | Claude Mythos Preview | [
"CVE-2026-40033",
"CVE-2026-44421"
] | [
"GHSA-mpxh-8fq3-x8mh",
"GHSA-mvpx-xj7r-3p3r",
"GHSA-p6r2-4hgm-m6ff"
] | sanitizer_common_interceptors.inc:827 | ANT-2026-RXYVE4DZ: Heap-buffer-overflow in sanitizer_common_interceptors.inc:827 | "In FreeRDP's RDPGFX handler, gdi_CacheToSurface (libfreerdp/gdi/gfx.c:1552) validates a destination(...TRUNCATED) | "ASAN: heap-buffer-overflow WRITE of size 262140, 0 bytes to the right of a 4194344-byte region allo(...TRUNCATED) | "Send RDPGFX CreateSurface with width=65535, height=1 (allocates ~4,194,304-byte surface buffer)\nSe(...TRUNCATED) | "This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic(...TRUNCATED) | "ANT-2026-RXYVE4DZ: Heap-buffer-overflow in sanitizer_common_interceptors.inc:827\nIn FreeRDP's RDPG(...TRUNCATED) | Trail of Bits | true positive | "# ANT-2026-RXYVE4DZ: ANT-2026-RXYVE4DZ Β· freerdp/freerdp\n**Project:** freerdp/freerdp | **Bug Cla(...TRUNCATED) | "<!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" cont(...TRUNCATED) | fixed | true | 2026-03-24 | 2026-04-30 | "0c44262d039d2d96e1bca18c6ba2921c2566dcd498a233f42d427dd2b208cf3b6ebd2e0cb0c30267ec4d9c5269de8379573(...TRUNCATED) | 1,018 | 0 | 1,086 | 7,384 | 1,086 | |||
ANT-2026-ZJXVWQEA | https://red.anthropic.com/2026/cvd/findings/ANT-2026-ZJXVWQEA | flex | heap-buffer-overflow | low | low | low | - | Claude Mythos Preview | [] | [] | sf_init() | static analysis β not yet dynamically reproduced | ANT-2026-ZJXVWQEA: Heap buffer overflow in sf_init due to stale stack index when used as library | "sf_init retains a stale stack index when the code is used as a library, leading to a heap buffer ov(...TRUNCATED) | "This finding was identified by static analysis and has not yet been dynamically reproduced. A trigg(...TRUNCATED) | "This vulnerability was discovered by Claude, Anthropic's AI assistant, and triaged by the Anthropic(...TRUNCATED) | "ANT-2026-ZJXVWQEA: Heap buffer overflow in sf_init due to stale stack index when used as library\ns(...TRUNCATED) | Trail of Bits | true positive | "# ANT-2026-ZJXVWQEA: ANT-2026-ZJXVWQEA Β· flex\n**Project:** flex | **Bug Class:** heap-buffer-over(...TRUNCATED) | "<!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" cont(...TRUNCATED) | fixed | true | 2026-03-29 | 2026-04-09 | "90645dbe9ccfac3f9fa3c5562ff776efa99df8791aef9a3b31f25d9d06fb55c029e268824bb85fb1b10569894ab649367ec(...TRUNCATED) | 210 | 0 | 199 | 2,418 | 199 |
- π Overview & Executive Summary
- π Comprehensive Token & Corpus Statistics
- π€ Models Credited with Discoveries
- π Vulnerability Taxonomy & Bug Classes
- π’ Top Affected Open-Source Projects
- π€ Security Research Firms & Triage Partners
- π Master Ledger Status Distribution
- ποΈ Dataset Schema
- π Quick Start Examples
- π Automated Updates
- βοΈ License & Ethical Disclosure
π‘οΈ Anthropic Red Teaming & Coordinated Vulnerability Disclosure (CVD) Archive
Complete, high-fidelity research corpus of AI-discovered zero-day and N-day vulnerabilities, proof-of-concepts, independent triage reports, and upstream git fix patches.
Overview Β· Corpus & Token Stats Β· Model Attribution Β· Vulnerability Taxonomy Β· Target Projects Β· Triage Partners Β· Dataset Schema Β· Quick Start
π Overview & Executive Summary
The Anthropic Red Teaming & Coordinated Vulnerability Disclosure (CVD) Archive is an exhaustive, structured database capturing all vulnerability discoveries conducted by Anthropic's frontier AI models (including Claude Opus 4.6 and early development snapshots of Claude Mythos Preview) published under Anthropic's Coordinated Vulnerability Disclosure Policy.
Curated and maintained by Sphita AI Research, this dataset represents one of the world's most significant empirical corpora of autonomous AI software vulnerability identification, exploit pathing, and patch verification in production-critical open-source software (PostgreSQL, FreeBSD, LibreOffice, WolfSSL, Mastodon, Firecracker, etc.).
Key Highlights
- Full Multi-Party Triaged Dossiers: Every revealed finding contains the complete root-cause analysis by Claude, independent validation by partner security firms, and severity assessments from maintainers.
- Direct Git Unified Patches: Paired with every resolved vulnerability is the exact upstream fix diff applied to resolve the defect.
- BPE Token Profiling: All text fields, reports, diffs, and syntheses are measured using the OpenAI/Claude standard
cl100k_baseBPE tokenizer. - Dual Format Persistence: Packaged into zero-overhead Apache Parquet tables (compressed via Zstandard-7) and line-delimited JSONL files.
- Master Commitment Ledger: Contains all 6,597 commitments tracked in Anthropic's disclosure registry.
π Comprehensive Token & Corpus Statistics
All token counts are computed deterministically using tiktoken with the cl100k_base BPE tokenizer:
| Metric | cl100k Tokens | Percentage | Description |
|---|---|---|---|
| Clean Markdown Representation | 252.1K | 100.0% | Complete synthesis for training / instruction fine-tuning |
| Vulnerability Technical Reports | 153.4K | ~35.0% | Root-cause analysis, target commits, and location specs |
| Upstream Fix Diffs (Patches) | 110.8K | ~40.0% | Unified git diffs resolving the vulnerabilities |
| Total Filtered Corpus Tokens | 362.9K | 100.0% | Combined high-density tokens |
Dataset Overview Table
| Category | Value | Notes |
|---|---|---|
| Total Commitments in Ledger | 6,597 | All SHA3-512 commitment records in disclosure tracker |
| Fully Revealed Finding Dossiers | 237 | Expired disclosure embargoes with complete reports & diffs |
| Unique CVE Identifiers Issued | 101 | Official NIST NVD CVE records |
| Unique GitHub Security Advisories | 80 | Official GHSA advisories |
| Unique Target Open Source Repositories | 20 | Infrastructure, virtualization, databases, and runtimes |
π€ Models Credited with Discoveries
Distribution of vulnerability discoveries attributed to specific frontier Claude checkpoints:
| Model Checkpoint | Discoveries | Share | Role & Scope |
|---|---|---|---|
Claude Mythos Preview |
191 | 80.6% | |
Claude Opus 4.6 |
9 | 3.8% | |
an unreleased Anthropic model |
6 | 2.5% | |
Claude Sonnet 4.6 |
4 | 1.7% |
π Vulnerability Taxonomy & Bug Classes
Breakdown of identified vulnerability classes across the disclosed findings:
| Bug Class | Findings | Share |
|---|---|---|
heap-buffer-overflow |
90 | 38.0% |
other |
26 | 11.0% |
stack-buffer-overflow |
24 | 10.1% |
use-after-free |
19 | 8.0% |
auth-bypass |
8 | 3.4% |
sql-injection |
7 | 3.0% |
denial-of-service |
6 | 2.5% |
path-traversal |
6 | 2.5% |
oob-write |
5 | 2.1% |
integer-overflow |
4 | 1.7% |
broken-access-control |
4 | 1.7% |
double-free |
3 | 1.3% |
π’ Top Affected Open-Source Projects
The AI models targeted critical open-source infrastructure across networking, virtualization, and compilers:
| Repository / Project | Revealed Findings | Share | Tracking Dashboard |
|---|---|---|---|
ffmpeg/ffmpeg |
14 | 5.9% | Findings |
wolfssl/wolfssl |
12 | 5.1% | Findings |
libreoffice/core |
12 | 5.1% | Findings |
freerdp/freerdp |
11 | 4.6% | Findings |
supabase/supabase |
11 | 4.6% | Findings |
osgeo/gdal |
11 | 4.6% | Findings |
supabase/auth |
9 | 3.8% | Findings |
wireshark/wireshark |
8 | 3.4% | Findings |
torvalds/linux |
6 | 2.5% | Findings |
supabase/postgres |
4 | 1.7% | Findings |
opensc |
4 | 1.7% | Findings |
selinux |
3 | 1.3% | Findings |
cisco-talos/clamav |
3 | 1.3% | Findings |
oisf/suricata |
3 | 1.3% | Findings |
c-blosc2 |
3 | 1.3% | Findings |
π€ Security Research Firms & Triage Partners
Anthropic partners with leading security research firms to independently reproduce findings and execute responsible disclosure:
| Security Research Firm | Validated Findings | Triage Role |
|---|---|---|
Ada Logics |
79 | Independent Triager & CVD Coordinator |
Trail of Bits |
59 | Independent Triager & CVD Coordinator |
Calif |
24 | Independent Triager & CVD Coordinator |
Doyensec |
7 | Independent Triager & CVD Coordinator |
Anvil Security |
6 | Independent Triager & CVD Coordinator |
Ophion Security |
4 | Independent Triager & CVD Coordinator |
π Master Ledger Status Distribution
Status of all 6,597 commitments tracked in the master registry:
| Disclosure Status | Count | Share |
|---|---|---|
disclosed |
5,936 | 90.0% |
withdrawn |
246 | 3.7% |
fixed |
218 | 3.3% |
None |
195 | 3.0% |
merged |
2 | 0.0% |
ποΈ Dataset Schema
Configuration 1: findings-revealed (data/findings_revealed.parquet)
| Column Name | PyArrow Type | Description |
|---|---|---|
ant_id |
string |
Unique Anthropic finding identifier (e.g., ANT-2026-CJQWKW82) |
source_url |
string |
Canonical disclosure URL on red.anthropic.com |
project |
string |
Target repository identifier (e.g., postgres/postgres) |
bug_class |
string |
Classification of the defect (e.g., denial-of-service) |
headline_severity |
string |
Headline severity rating (critical, high, medium, low) |
claude_severity |
string |
Severity assessed by the discovering Claude model |
vendor_severity |
string |
Severity verified by the independent security research firm |
maintainer_severity |
string |
Severity confirmed by upstream project maintainers |
discovered_by_model |
string |
Frontier Claude model credited (e.g., Claude Opus 4.6) |
cve_ids |
list<string> |
Associated CVE records |
ghsa_ids |
list<string> |
Associated GitHub Security Advisory identifiers |
target_commit |
string |
Git commit SHA of the audited codebase snapshot |
target_location |
string |
Exact source code file path and line number of vulnerability |
discovery_method |
string |
Method used (e.g., static analysis, symbolic execution) |
report_title |
string |
Title of the vulnerability report |
report_summary |
string |
Concise synopsis of exploitation mechanism |
technical_details |
string |
Deep technical explanation of the flaw |
reproduction_notes |
string |
Reproduction steps and exploit prerequisites |
acknowledgement |
string |
Program attribution and contact details |
report_full_text |
string |
Complete verbatim report text |
security_firm_name |
string |
Name of the third-party security firm (e.g., Calif, Trail of Bits) |
security_firm_verdict |
string |
Firm determination (e.g., true positive) |
upstream_fix_diff |
string |
Complete unified git diff applied by maintainers |
clean_markdown |
string |
Formatted markdown document ready for LLM fine-tuning |
raw_html |
string |
Original unparsed HTML document |
status |
string |
Disclosure status (disclosed, fixed, etc.) |
patched |
bool |
Whether an official fix has shipped |
discovered_on |
string |
ISO discovery date |
committed_at |
string |
ISO commitment date |
hash |
string |
SHA3-512 commitment proof |
tokens_cl100k_report |
int64 |
cl100k_base token count of report |
tokens_cl100k_diff |
int64 |
cl100k_base token count of git diff |
tokens_cl100k_markdown |
int64 |
cl100k_base token count of synthesized markdown |
tokens_cl100k_total |
int64 |
Combined research tokens (markdown + diff) |
π Quick Start Examples
Python (datasets)
from datasets import load_dataset
# Load detailed revealed findings
dataset = load_dataset("sphita/anthropic-red", name="findings-revealed", split="train")
print(f"Loaded {len(dataset)} detailed vulnerability dossiers")
# Inspect a finding
sample = dataset[0]
print("ID:", sample["ant_id"])
print("Project:", sample["project"])
print("Model:", sample["discovered_by_model"])
print("Diff Tokens:", sample["tokens_cl100k_diff"])
Python (pandas / pyarrow)
import pandas as pd
df = pd.read_parquet("https://huggingface.co/datasets/sphita/anthropic-red/resolve/main/data/findings_revealed.parquet")
print(df[["ant_id", "project", "bug_class", "discovered_by_model", "tokens_cl100k_total"]].head(10))
π Automated Updates
This dataset is dynamically updated via the Sphita Ingestion Pipeline:
./run.sh --update --upload
The pipeline automatically tracks newly disclosed commitments, fetches incremental finding writeups, verifies token statistics under a strict < 500 MiB RAM budget, and updates the repository.
βοΈ License & Ethical Disclosure
- License: GNU General Public License v3.0 (GPL-3.0).
- Coordinated Disclosure: All findings contained in this dataset have completed their standard responsible disclosure period under Anthropic's Coordinated Vulnerability Disclosure Policy.
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