{"id":"CVE-2026-59937","aliases":["GHSA-55h5-xmcq-c37v","PYSEC-2026-3610"],"url":"https://o3.security/vulnerability/CVE-2026-59937","summary":"pypdf: Possible long runtimes for repeated malformed cross-reference entries","details":"pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.","published":"2026-07-08T17:25:34.026Z","modified":"2026-08-18T17:41:57.359552337Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.14.0"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae","label":"py-pdf/pypdf@b5fc5aa"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.14.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59937.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59937"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3887"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T17:41:57.359552337Z"}}