{"id":"CVE-2026-57585","state":"PUBLISHED","title":"MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error","description":"MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack.  If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.","publishedAt":"2026-06-30T21:36:23.418Z","updatedAt":"2026-07-01T14:54:36.191Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["msgpack msgpack-python"],"affected":[{"vendor":"msgpack","product":"msgpack-python","versions":[{"version":"< 1.2.1","status":"affected"}]}],"references":["https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964","https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/57xxx/CVE-2026-57585.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-57585","state":"PUBLISHED","datePublished":"2026-06-30T21:36:23.418Z","dateUpdated":"2026-07-01T14:54:36.191Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-24T18:49:56.209Z"},"containers":{"cna":{"title":"MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error","descriptions":[{"lang":"en","value":"MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack.  If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1."}],"affected":[{"vendor":"msgpack","product":"msgpack-python","versions":[{"version":"< 1.2.1","status":"affected"}]}],"references":[{"url":"https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964","name":"https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d","name":"https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","description":"CWE-416: Use After Free","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-30T21:36:23.418Z"},"source":{"advisory":"GHSA-6v7p-g79w-8964","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-01T14:54:21.105642Z","id":"CVE-2026-57585","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-01T14:54:36.191Z"}}]}}}