{"action":"Upgrade pypdf2 to 1.27.9 or later.","affected":[{"fixed":"1.27.9","introduced":"0"}],"component":"pypdf2","cve_ids":["CVE-2023-36810"],"ecosystem":"PyPI","epss":0.0063,"exploited":false,"fixed_versions":["1.27.9"],"ghsa_id":"GHSA-jrm6-h9cq-8gqw","id":"tcs_01M5KGVZHFE8Y1CR9EWHESS81T","modified_at":"2026-07-07T17:46:59.524042100Z","published_at":"2026-07-07T11:45:19.715500Z","references":["https://osv.dev/vulnerability/PYSEC-2026-1837","https://github.com/py-pdf/pypdf/security/advisories/GHSA-jrm6-h9cq-8gqw","https://nvd.nist.gov/vuln/detail/CVE-2023-36810","https://github.com/py-pdf/pypdf/issues/582","https://github.com/py-pdf/pypdf/pull/808","https://github.com/py-pdf/pypdf/commit/c6c56f550bb384e05f0139c796ba1308837d6373","https://github.com/py-pdf/pypdf","https://lists.debian.org/debian-lts-announce/2023/07/msg00019.html","https://pypi.org/project/pypdf2","https://github.com/advisories/GHSA-jrm6-h9cq-8gqw"],"severity":{"label":"medium","score":6.2},"sources":[{"source":"osv","source_id":"PYSEC-2026-1837","url":"https://osv.dev/vulnerability/PYSEC-2026-1837"}],"summary":"PyPDF2 quadratic runtime with malformed PDF missing xref marker"}