{"action":"Upgrade cbor2 to 5.7.1 or later.","affected":[{"fixed":"5.7.1","introduced":"0"}],"component":"cbor2","cve_ids":["CVE-2025-64076"],"ecosystem":"PyPI","epss":0.00489,"exploited":false,"fixed_versions":["5.7.1"],"ghsa_id":"GHSA-9q9c-vjxh-p795","id":"tcs_01M5KGPCHDK2DA8PBN8QQ874TR","modified_at":"2026-09-10T11:15:08.179863706Z","published_at":"2025-11-18T18:16:14.263Z","references":["https://osv.dev/vulnerability/PYSEC-2025-238","https://github.com/agronholm/cbor2/issues/264","https://github.com/agronholm/cbor2/commit/851473490281f82d82560b2368284ef33cf6e8f9","https://github.com/agronholm/cbor2/pull/265","https://github.com/advisories/GHSA-9q9c-vjxh-p795"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2025-238","url":"https://osv.dev/vulnerability/PYSEC-2025-238"}],"summary":"Multiple vulnerabilities exist in cbor2 through version 5.7.0 in the decode_definite_long_string() function of the C extension decoder (source/decoder.c): (1) Integer Underflow Leading to Out-of-Bound"}