flatcc through 0.6.4 Out-of-Bounds Read via __flatcc_json_parser_number

{
  "id": "7d29299b0bec2b08e13e1582cb2b91f740b8f43374c200280ddfe250eb1e21fc",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116733",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "flatcc through 0.6.4 Out-of-Bounds Read via __flatcc_json_parser_number",
    "summary": "flatcc through 0.6.4 contains an out-of-bounds read vulnerability in __flatcc_json_parser_number that allows attackers to read past the input buffer via numbers ending in a decimal point. Attackers can supply untrusted JSON ending immediately after a decimal point to generated parsers, crashing applications when the buffer ends at an unmapped page.",
    "evidence": "cve:CVE-2026-116733",
    "products": [
      {
        "name": {
          "value": "flatcc",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-116733",
      "aliases": [
        "CVE-2026-116733"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6.3,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 3.7,
            "attackVector": "NETWORK",
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "availabilityImpact": "LOW",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "repo": "https://github.com/dvidelabs/flatcc",
          "vendor": "dvidelabs",
          "product": "flatcc",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "custom",
              "lessThanOrEqual": "0.6.4"
            }
          ],
          "packageURL": "pkg:github/dvidelabs/flatcc",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-26T21:52:34.304Z",
      "provider": "cve",
      "references": [
        "https://github.com/dvidelabs/flatcc/commit/356792dc155a9e685acdfe0ec1e209bdadcb4ab9",
        "https://github.com/dvidelabs/flatcc",
        "https://github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/json_parser.c#L539-L543",
        "https://hackmd.io/@haindpwn/flatcc-json-number-oob-read",
        "https://www.vulncheck.com/advisories/flatcc-through-0.6.4-out-of-bounds-read-via-flatcc-json-parser-number"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
          "shortName": "VulnCheck",
          "dateUpdated": "2026-10-26T21:52:34.304Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116733",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 353934,
  "published_at": "2026-10-26T21:52:34.304+00:00"
}