{"id":"CVE-2026-119205","aliases":["GHSA-mfr5-77xh-9j7h"],"url":"https://o3.security/vulnerability/CVE-2026-119205","summary":"pypdf: Possible infinite loop when cloning dictionaries","details":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles to evade the visited-object check. This issue is fixed in version 6.21.4.","published":"2026-10-29T20:35:33.902Z","modified":"2026-10-31T02:47:37.549429351Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.21.4"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/f176db1a1f7f9af3e472e69a843ef1175653b044","label":"py-pdf/pypdf@f176db1"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119205.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-mfr5-77xh-9j7h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119205"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/f176db1a1f7f9af3e472e69a843ef1175653b044"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/4288"},{"type":"PACKAGE","url":"https://github.com/py-pdf/pypdf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-31T02:47:37.549429351Z"}}