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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 Reserved 2026-02-17 | Published 2026-02-20 | Updated 2026-02-24 | Assigner GitHub_M




MEDIUM: 6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Product status

< 6.7.1
affected

References

github.com/.../pypdf/security/advisories/GHSA-996q-pr4m-cvgq

github.com/py-pdf/pypdf/pull/3645

github.com/...ommit/bd2f6d052fe5941e85e37082c2a43453d48d1295

github.com/py-pdf/pypdf/releases/tag/6.7.1

cve.org (CVE-2026-27024)

nvd.nist.gov (CVE-2026-27024)

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