{"id":"CVE-2026-54531","aliases":["GHSA-m2v9-299j-rv96","PYSEC-2026-3022"],"url":"https://o3.security/vulnerability/CVE-2026-54531","summary":"pypdf: Possible infinite loop when processing outlines/bookmarks in writer","details":"pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0.","published":"2026-06-22T20:26:19.756Z","modified":"2026-08-12T03:51:26.737058509Z","cvss":null,"epss":{"score":0.00121,"percentile":0.02285,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.13.0"}],"fix":{"url":"https://github.com/py-pdf/pypdf/pull/3830","label":"py-pdf/pypdf#3830"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.13.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54531.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54531"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3830"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:26.737058509Z"}}