Publish x12 test data

CITATION.cff

@@ -4,7 +4,7 @@ title: "ANSI X12 Test Data"
 abstract: "Structurally complete X12 837P claim documents (ISA, GS, ST, BHT, NM1, CLM, SE, GE, IEA) with varying control numbers. Synthetic claims; not real patients or payers."
 type: dataset
 license: CC0-1.0
-version: "1.0.1"
+version: "1.0.2"
 date-released: "2026-10-01"
 authors:
   - name: "StanzaAPI"

README.md

@@ -41,7 +41,7 @@ https://stanzaapi.com/datasets/x12
 
 ## Security: adversarial corpus
 
-This dataset ships a catalogued **adversarial corpus** of 10 hostile inputs
+This dataset ships a catalogued **adversarial corpus** of 12 hostile inputs
 (injection, XXE, resource exhaustion, encoding attacks, validation bypass, structural confusion,
 and prompt injection for AI agents) with the safe expected behaviour. See
 [`adversarial/`](adversarial/) or the [hub](https://stanzaapi.com/datasets/adversarial).

adversarial/x12-adversarial.json

@@ -4,7 +4,7 @@
   "source": "https://stanzaapi.com/datasets/x12/adversarial",
   "license": "CC0-1.0",
   "format": "x12",
-  "count": 10,
+  "count": 12,
   "cases": [
     {
       "id": "x12-segment-injection",
@@ -115,6 +115,30 @@
       "expected": "Reject: claim and line amounts must balance.",
       "rationale": "An unbalanced claim can hide an over-bill or an under-payment.",
       "cwe": "CWE-20"
+    },
+    {
+      "id": "x12-duplicate-control-segment",
+      "format": "x12",
+      "category": "structure",
+      "severity": "high",
+      "title": "Duplicate BPR segment resolved by last-wins",
+      "payload": "BPR*I*1.00*C*ACH*CCP*01*999999999*DA*123456789*1*20260101~BPR*I*999999.00*C*ACH*CCP*01*999999999*DA*123456789*1*20260101~",
+      "expected": "Reject a second occurrence of a segment the transaction set defines once.",
+      "rationale": "Both segments are syntactically valid. A parser that keeps the last BPR remits a different amount than one that keeps the first, and the 835 balances either way because each parser checks against its own reading.",
+      "cwe": "CWE-20",
+      "evades": "well-formedness"
+    },
+    {
+      "id": "x12-repetition-separator-collision",
+      "format": "x12",
+      "category": "structure",
+      "severity": "high",
+      "title": "Repetition separator that occurs inside a data element",
+      "payload": "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *260101*1200*^*00501*000000001*0*P*:^~NM1*IL*1*DOE*JOHN*^SMITH~",
+      "expected": "Reject a repetition separator that appears inside a data value, or escape it per the implementation guide; do not split the value into repeats silently.",
+      "rationale": "The separator is declared in ISA11 and the same character occurs in the surname. A parser that splits on it reads two names where the sender wrote one, and every field after it shifts.",
+      "cwe": "CWE-20",
+      "evades": "well-formedness"
     }
   ]
 }