{"cve":"CVE-2025-66019","nvd":{"published":"2025-11-26T00:15:51.263","modified":"2026-10-19T13:10:00.110","status":"Deferred","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","score":6.6},"cvss_v3":null,"cwes":["CWE-400","CWE-409"],"references":["https://github.com/py-pdf/pypdf/commit/96186725e5e6f237129a58a97cd19204a9ce40b2","https://github.com/py-pdf/pypdf/releases/tag/6.4.0","https://github.com/py-pdf/pypdf/security/advisories/GHSA-m449-cwjh-6pw7","https://aydinnyunus.github.io/2025/12/20/cve-2025-66019-pypdf-lzw-dos/"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:02.354564667+00:00"},"epss":{"cve":"CVE-2025-66019","score":0.00361,"percentile":0.29633,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-m449-cwjh-6pw7","url":"https://osv.dev/vulnerability/GHSA-m449-cwjh-6pw7","summary":"pypdf's LZWDecode streams be manipulated to exhaust RAM","modified":"2026-09-10T03:50:31.107367078Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.4.0"],"fixed":["6.4.0"]}]},{"id":"PYSEC-2026-1832","url":"https://osv.dev/vulnerability/PYSEC-2026-1832","summary":"pypdf's LZWDecode streams be manipulated to exhaust RAM","modified":"2026-07-07T17:46:59.109908172Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.4.0"],"fixed":["6.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}