{"cve":"CVE-2026-22691","nvd":{"published":"2026-01-10T05:16:08.680","modified":"2026-06-17T10:20:14.553","status":"Analyzed","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","score":2.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-400","CWE-1333"],"references":["https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45","https://github.com/py-pdf/pypdf/pull/3594","https://github.com/py-pdf/pypdf/releases/tag/6.6.0","https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv"],"products":["pypdf_project:pypdf"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2026-22691","score":0.00433,"percentile":0.37658,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4f6g-68pf-7vhv","url":"https://osv.dev/vulnerability/GHSA-4f6g-68pf-7vhv","summary":"pypdf has possible long runtimes for malformed startxref","modified":"2026-07-07T17:56:05.491150444Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.6.0"],"fixed":["6.6.0"]}]},{"id":"PYSEC-2026-1828","url":"https://osv.dev/vulnerability/PYSEC-2026-1828","summary":"pypdf has possible long runtimes for malformed startxref","modified":"2026-07-07T17:47:50.544051989Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.6.0"],"fixed":["6.6.0"]}]}],"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."]}