{"cve":"CVE-2026-27026","nvd":{"published":"2026-02-20T22:16:29.023","modified":"2026-06-17T10:26:34.853","status":"Analyzed","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-770"],"references":["https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016","https://github.com/py-pdf/pypdf/pull/3644","https://github.com/py-pdf/pypdf/releases/tag/6.7.1","https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h"],"products":["pypdf_project:pypdf"],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-27026","score":0.00191,"percentile":0.08764,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-9mvc-8737-8j8h","url":"https://osv.dev/vulnerability/GHSA-9mvc-8737-8j8h","summary":"pypdf possibly has long runtimes for malformed FlateDecode streams","modified":"2026-09-10T03:50:34.680998937Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.7.1"],"fixed":["6.7.1"]}]},{"id":"PYSEC-2026-3015","url":"https://osv.dev/vulnerability/PYSEC-2026-3015","summary":"pypdf possibly has long runtimes for malformed FlateDecode streams","modified":"2026-07-13T16:33:09.769451758Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.7.1"],"fixed":["6.7.1"]}]}],"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."]}