{"id":"CVE-2026-84310","aliases":["GHSA-23w6-3w8w-8484","PYSEC-2026-3910"],"url":"https://o3.security/vulnerability/CVE-2026-84310","summary":"pypdf: Possible long runtimes/large memory usage when retrieving outlines","details":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths.\n\n### Patches\n\nThis has been fixed in [pypdf==6.16.1](https://github.com/py-pdf/pypdf/releases/tag/6.16.1).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3966](https://github.com/py-pdf/pypdf/pull/3966).","published":"2026-09-01T20:00:59.455Z","modified":"2026-10-07T02:45:18.242216373Z","cvss":null,"epss":{"score":0.00138,"percentile":0.03552,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.16.1"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942","label":"py-pdf/pypdf@d91ab70"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.16.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84310.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-23w6-3w8w-8484"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84310"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3966"},{"type":"PACKAGE","url":"https://github.com/py-pdf/pypdf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-07T02:45:18.242216373Z"}}