{"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":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.\n\n### Patches\n\nThis has been fixed in [pypdf==6.14.0](https://github.com/py-pdf/pypdf/releases/tag/6.14.0).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3887](https://github.com/py-pdf/pypdf/pull/3887).","published":"2026-07-08T17:25:34.026Z","modified":"2026-08-27T14:10:52.229574080Z","cvss":null,"epss":{"score":0.0034,"percentile":0.27231,"asOf":"2026-09-12"},"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"},{"type":"PACKAGE","url":"https://github.com/py-pdf/pypdf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T14:10:52.229574080Z"}}