{"id":"CVE-2026-27024","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-27024","generatedAt":"2026-10-28T02:23:44.643Z","title":"Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop.","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an 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. This vulnerability is fixed in 6.7.1.","published":"2026-02-20T22:16:29.000Z","lastModified":"2026-06-17T10:26:35.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-835"],"affected":["pypdf project/pypdf"],"epss":{"score":0.00191,"percentile":0.0863,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/py-pdf/pypdf/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/pull/3645","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.7.1","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgq","tags":["Patch","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-27024","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}