{"id":"CVE-2025-66019","aliases":["GHSA-m449-cwjh-6pw7","PYSEC-2026-1832"],"url":"https://o3.security/vulnerability/CVE-2025-66019","summary":"pypdf manipulated LZWDecode streams can exhaust RAM","details":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.4.0, an attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter. This issue has been patched in version 6.4.0.","published":"2025-11-25T23:38:12.473Z","modified":"2026-07-15T01:49:22.499863119Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.4.0"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/96186725e5e6f237129a58a97cd19204a9ce40b2","label":"py-pdf/pypdf@9618672"},"references":[{"type":"WEB","url":"https://aydinnyunus.github.io/2025/12/20/cve-2025-66019-pypdf-lzw-dos/"},{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.4.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66019.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-m449-cwjh-6pw7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66019"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/96186725e5e6f237129a58a97cd19204a9ce40b2"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:22.499863119Z"}}