{
  "name": "vat adversarial corpus",
  "description": "Documented hostile inputs for a parser, validator, or AI agent that reads this format, each with the safe expected behaviour.",
  "source": "https://stanzaapi.com/datasets/vat/adversarial",
  "license": "CC0-1.0",
  "format": "vat",
  "count": 12,
  "cases": [
    {
      "id": "vat-crlf-header-injection",
      "format": "vat",
      "category": "injection",
      "severity": "critical",
      "title": "CRLF into the VIES subrequest",
      "payload": "DE123456789\r\nX-Injected: 1",
      "expected": "Reject control characters before building the VIES request; never echo the value into a header.",
      "rationale": "VIES validation makes an outbound call — CRLF can inject headers into it.",
      "cwe": "CWE-93"
    },
    {
      "id": "vat-ssrf-url",
      "format": "vat",
      "category": "injection",
      "severity": "critical",
      "title": "SSRF via a URL-shaped VAT number",
      "payload": "http://169.254.169.254/latest/meta-data/",
      "expected": "Reject: a VAT number is a country prefix plus a national pattern, never a URL.",
      "rationale": "If the value is used to build a lookup URL, an attacker can target the cloud metadata endpoint.",
      "cwe": "CWE-918"
    },
    {
      "id": "vat-sql-injection",
      "format": "vat",
      "category": "injection",
      "severity": "high",
      "title": "SQL injection in the VAT field",
      "payload": "IE1234567T'; DROP TABLE vat;--",
      "expected": "Reject on structure; parameterise any query.",
      "rationale": "Same class as the IBAN case, on the VAT path.",
      "cwe": "CWE-89"
    },
    {
      "id": "vat-template-injection",
      "format": "vat",
      "category": "injection",
      "severity": "high",
      "title": "Template expression in the VAT field",
      "payload": "DE${7*7}123456789",
      "expected": "Reject on structure; do not evaluate untrusted values.",
      "rationale": "Template injection if the value is rendered server-side.",
      "cwe": "CWE-1336"
    },
    {
      "id": "vat-log-forging",
      "format": "vat",
      "category": "injection",
      "severity": "medium",
      "title": "Log forging in the VAT field",
      "payload": "EE123456789\nWARN vies: valid",
      "expected": "Reject control characters; escape before logging.",
      "rationale": "Injected newlines forge audit-trail entries.",
      "cwe": "CWE-117"
    },
    {
      "id": "vat-homoglyph-prefix",
      "format": "vat",
      "category": "encoding",
      "severity": "high",
      "title": "Cyrillic homoglyph in the country prefix",
      "payload": "DЕ123456789 (D + Cyrillic Е)",
      "expected": "Reject: the prefix must be ASCII A-Z.",
      "rationale": "Homoglyph prefixes defeat registry lookups and case-folding.",
      "cwe": "CWE-1007"
    },
    {
      "id": "vat-null-byte",
      "format": "vat",
      "category": "encoding",
      "severity": "medium",
      "title": "Null byte in the VAT field",
      "payload": "DE123456789\u0000",
      "expected": "Reject control characters.",
      "rationale": "Truncation can hide trailing content from one layer and not another.",
      "cwe": "CWE-158"
    },
    {
      "id": "vat-resource-long",
      "format": "vat",
      "category": "resource",
      "severity": "medium",
      "title": "Oversized VAT number",
      "payload": "DE99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999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999",
      "expected": "Reject on the national length rule before any external lookup.",
      "rationale": "Bounds the cost of the check and the outbound request.",
      "cwe": "CWE-400"
    },
    {
      "id": "vat-unknown-prefix",
      "format": "vat",
      "category": "structure",
      "severity": "low",
      "title": "Unregistered country prefix",
      "payload": "XX123456789",
      "expected": "Reject: unknown prefix.",
      "rationale": "A validator must not fall back to a permissive default.",
      "cwe": "CWE-20"
    },
    {
      "id": "vat-el-vs-gr",
      "format": "vat",
      "category": "validation-bypass",
      "severity": "low",
      "title": "Greece is EL, not GR",
      "payload": "GR123456789 (should be EL)",
      "expected": "Reject or normalise to EL, per VIES. Document the choice.",
      "rationale": "Greece uses the EL prefix for VAT; GR is the ISO country code, not the VAT prefix.",
      "cwe": "CWE-20"
    },
    {
      "id": "vat-zero-width-separator",
      "format": "vat",
      "category": "encoding",
      "severity": "high",
      "title": "Zero-width separator inside the VAT number",
      "payload": "DE​123456789",
      "expected": "Reject zero-width and format characters rather than trimming them; the bytes stored must equal the characters displayed.",
      "rationale": "A zero-width space renders invisibly, so the number looks valid in every UI while the stored bytes differ from the visible value. A layer that trims and a layer that compares raw will disagree.",
      "cwe": "CWE-176",
      "evades": "national pattern (after trimming)"
    },
    {
      "id": "vat-format-valid-not-registered",
      "format": "vat",
      "category": "validation-bypass",
      "severity": "critical",
      "title": "Well-formed VAT number that is not a registered VIES number",
      "payload": "DE123456789",
      "expected": "Report format validity and registration as separate facts. Offline syntax validation must never be surfaced as VIES confirmation.",
      "rationale": "The classic zero-rating trap: the syntax passes, so a checkout that equates \"format valid\" with \"VIES valid\" applies 0% VAT to a supply that is not zero-rated. Only a live VIES lookup can confirm registration.",
      "cwe": "CWE-20",
      "evades": "national pattern (the number is well-formed)"
    }
  ]
}