{"id":"CVE-2026-113791","aliases":["GHSA-cgf9-327m-v77c"],"title":"pypdf: Possible large memory usage when parsing content streams","summary":"pypdf: Possible large memory usage when parsing content streams","severity":"medium","cvss":6,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","vendor":"pypdf","product":"pypdf","ecosystem":"pip","affected":["pypdf < 6.21.0"],"patched":["pypdf 6.21.0"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T17:00:04.215115256Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-cgf9-327m-v77c","references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77c"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113791"},{"url":"https://github.com/py-pdf/pypdf/pull/4218"},{"url":"https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12"},{"url":"https://github.com/py-pdf/pypdf"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.0"},{"url":"https://github.com/advisories/GHSA-cgf9-327m-v77c"}],"tags":["osv","pip","ghsa","cve.org"],"epss":0.00392,"epssPercentile":0.33135,"cvssSource":"cna","cwe":["CWE-400","CWE-770"],"ingestedAt":"2026-10-21T16:05:17.697Z","slug":"CVE-2026-113791","body":"## Overview\n\n### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations.\n\n### Patches\n\nThis has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#4218](https://github.com/py-pdf/pypdf/pull/4218).\n\n## Affected packages\n\n- `pypdf < 6.21.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `pypdf 6.21.0`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":33,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}