{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-114613", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-21T20:34:25.599Z", "datePublished": "2026-10-22T18:22:40.544Z", "dateUpdated": "2026-10-22T18:22:40.544Z"}, "containers": {"cna": {"title": "MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure", "problemTypes": [{"descriptions": [{"cweId": "CWE-401", "lang": "en", "description": "CWE-401: Missing Release of Memory after Effective Lifetime", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/msgpack/msgpack-python/security/advisories/GHSA-j586-36cw-2gc2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/msgpack/msgpack-python/security/advisories/GHSA-j586-36cw-2gc2"}, {"name": "https://github.com/msgpack/msgpack-python/commit/620b0eb4c89cd72d4098564537624d9dbb2ce141", "tags": ["x_refsource_MISC"], "url": "https://github.com/msgpack/msgpack-python/commit/620b0eb4c89cd72d4098564537624d9dbb2ce141"}, {"name": "https://github.com/msgpack/msgpack-python/releases/tag/v1.2.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/msgpack/msgpack-python/releases/tag/v1.2.3"}], "affected": [{"vendor": "msgpack", "product": "msgpack-python", "versions": [{"version": "< 1.2.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-22T18:22:40.544Z"}, "descriptions": [{"lang": "en", "value": "MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.3, the msgpack-python C extension (msgpack._cmsgpack) leaks a decoded map value when deserialization rejects a key with strict_map_key=True (the default). Repeated malformed inputs can cause unbounded process memory growth and denial of service in applications that deserialize attacker-controlled MessagePack data. Both unpackb() and the streaming Unpacker API are affected. The pure-Python fallback does not exhibit this leak in the reported tests. This issue is fixed in version 1.2.3."}], "source": {"advisory": "GHSA-j586-36cw-2gc2", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "msgpack-python", "vendor": "msgpack", "versions": [{"status": "affected", "version": "< 1.2.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.3, the msgpack-python C extension (msgpack._cmsgpack) leaks a decoded map value when deserialization rejects a key with strict_map_key=True (the default). Repeated malformed inputs can cause unbounded process memory growth and denial of service in applications that deserialize attacker-controlled MessagePack data. Both unpackb() and the streaming Unpacker API are affected. The pure-Python fallback does not exhibit this leak in the reported tests. This issue is fixed in version 1.2.3."}], "id": "CVE-2026-114613", "lastModified": "2026-10-22T19:17:37.733", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-22T19:17:37.733", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/msgpack/msgpack-python/commit/620b0eb4c89cd72d4098564537624d9dbb2ce141"}, {"source": "security-advisories@github.com", "url": "https://github.com/msgpack/msgpack-python/releases/tag/v1.2.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/msgpack/msgpack-python/security/advisories/GHSA-j586-36cw-2gc2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.2.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "msgpack-python", "source": "cna", "vendor": "msgpack"}, "product": "msgpack-python", "vendor": "msgpack"}], "created": "2026-10-23T03:30:15.964309+00:00", "updated": "2026-10-23T04:30:03.792000+00:00", "vendors": ["msgpack", "msgpack$PRODUCT$msgpack-python"]}