{"id":"CVE-2026-57585","summary":"MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error","details":"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.","aliases":["GHSA-6v7p-g79w-8964"],"modified":"2026-07-09T18:29:35.316687348Z","published":"2026-06-30T21:36:23.418Z","related":["openSUSE-SU-2026:21239-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-416"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57585.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57585.json"},{"type":"ADVISORY","url":"https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57585"},{"type":"FIX","url":"https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/msgpack/msgpack-python","events":[{"introduced":"0"},{"fixed":"2c56ddb5d0025ed481d962c0f5d62d19dec7476d"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"1.2.1"}]}}],"versions":["v1.2.0","v1.2.0rc1","v1.1.2","v1.1.1","v1.1.1rc1","v1.1.0","v1.1.0rc2","v1.1.0rc1","v1.0.8","v1.0.7","v1.0.6","v1.0.6rc1","v1.0.5","v1.0.5rc1","v1.0.4","v1.0.4rc1","v1.0.3","v1.0.3rc1","v1.0.2","v1.0.1","v1.0.0","v1.0.0rc1","v0.6.2","v0.6.1","v0.6.0","0.5.6","0.5.5","0.5.4","0.5.2","0.5.1","0.5.0","0.4.7","0.4.6","0.4.4","0.4.3","0.4.2","0.4.1","0.4.0","0.3.0","0.2.2","0.2.1","0.2.0","0.1.13","0.1.12","0.1.11","0.1.10"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57585.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}