CVE-2026-33699: Pypdf Project Pypdf

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Pypdf Project Pypdf: before 6.9.2 (fixed in 6.9.2)

Published 2026-03-27. Last modified 2026-06-17.