CVE-2026-103000: Pypdf Project Pypdf

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.

Affected products

• Pypdf Project Pypdf: before 6.19.0 (fixed in 6.19.0)

Published 2026-09-30. Last modified 2026-10-05.