{"id":"CVE-2020-15904","aliases":["GHSA-f8m3-jpxr-hm5x","PYSEC-2020-30"],"url":"https://o3.security/vulnerability/CVE-2020-15904","summary":"bsdiff4 out-of-bounds write via patch file","details":"A buffer overflow in the patching routine of bsdiff4 before 1.2.0 allows an attacker to write to heap memory (beyond allocated bounds) via a crafted patch file.","published":"2020-07-22T23:15:11.330Z","modified":"2026-07-08T19:03:20.568293Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"bsdiff4","fixedVersion":"1.2.0"}],"fix":{"url":"https://github.com/ilanschnell/bsdiff4/commit/49a4cee2feef7deaf9d89e5e793a8824930284d7","label":"ilanschnell/bsdiff4@49a4cee"},"references":[{"type":"ADVISORY","url":"https://github.com/ilanschnell/bsdiff4/blob/master/CHANGELOG.txt"},{"type":"FIX","url":"https://github.com/ilanschnell/bsdiff4/commit/49a4cee2feef7deaf9d89e5e793a8824930284d7"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T19:03:20.568293Z"}}