{"id":"CVE-2021-25292","aliases":["BIT-pillow-2021-25292","GHSA-9hx2-hgq2-2g4f","PYSEC-2021-38"],"url":"https://o3.security/vulnerability/CVE-2021-25292","summary":"Regular Expression Denial of Service (ReDoS) in Pillow","details":"An issue was discovered in Pillow before 8.1.1. The PDF parser allows a regular expression DoS (ReDoS) attack via a crafted PDF file because of a catastrophic backtracking regex.","published":"2021-03-19T04:15:13.590Z","modified":"2026-08-07T16:50:50.736347Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"pillow","fixedVersion":"8.1.1"}],"fix":{"url":"https://github.com/python-pillow/Pillow/commit/3bce145966374dd39ce58a6fc0083f8d1890719c","label":"python-pillow/Pillow@3bce145"},"references":[{"type":"ADVISORY","url":"https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202107-33"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25292"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/3bce145966374dd39ce58a6fc0083f8d1890719c"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/521dab94c7ab72b037bd9a83e9663401e0fd2cee"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/6207b44ab1ff4a91d8ddc7579619876d0bb191a4"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-9hx2-hgq2-2g4f"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-38.yaml"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T16:50:50.736347Z"}}