{"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":"2026-10-23T21:08:06.271Z"},"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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-23T17:32:58.847580Z","id":"CVE-2026-114613","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-23T21:08:06.271Z"}}]}}