{"id":"CVE-2026-27024","aliases":["GHSA-996q-pr4m-cvgq","PYSEC-2026-3013"],"title":"pypdf has a possible infinite loop when processing TreeObject","summary":"pypdf has a possible infinite loop when processing TreeObject","severity":"medium","vendor":"pypdf","product":"pypdf","ecosystem":"pip","affected":["pypdf < 6.7.1"],"patched":["pypdf 6.7.1"],"published":"2026-02-18","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:34.616221084Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-996q-pr4m-cvgq","references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgq"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27024"},{"url":"https://github.com/py-pdf/pypdf/pull/3645"},{"url":"https://github.com/py-pdf/pypdf/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295"},{"url":"https://github.com/py-pdf/pypdf"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.7.1"}],"tags":["osv","pip"],"epss":0.00174,"epssPercentile":0.0721,"ingestedAt":"2026-07-13T18:57:55.828Z","slug":"CVE-2026-27024","body":"## Overview\n\n### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a `TreeObject`, for example as part of outlines.\n\n### Patches\n\nThis has been fixed in [pypdf==6.7.1](https://github.com/py-pdf/pypdf/releases/tag/6.7.1).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3645](https://github.com/py-pdf/pypdf/pull/3645).\n\n## Affected packages\n\n- `pypdf < 6.7.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `pypdf 6.7.1`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}