CVE-2026-59937: 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. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.

Affected products

• Pypdf Project Pypdf: before 6.14.0 (fixed in 6.14.0)

Published 2026-07-08. Last modified 2026-07-09.