CVE-2026-31826: Pypdf Project Pypdf

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.

Affected products

• Pypdf Project Pypdf: before 6.8.0 (fixed in 6.8.0)

Published 2026-03-10. Last modified 2026-06-17.