CVE-2026-33699

Description

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-26 | Updated 2026-03-27 | Assigner GitHub_M

Problem types

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

Product status

References

github.com/.../pypdf/security/advisories/GHSA-87mj-5ggw-8qc3

github.com/py-pdf/pypdf/pull/3693

github.com/py-pdf/pypdf/releases/tag/6.9.2

cve.org (CVE-2026-33699)

nvd.nist.gov (CVE-2026-33699)

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