[ CVE-2026-102995 · Published 30 Sep 2026 ]
pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
CVSS 7.5
EPSS <1%Fix available
[ Description ]Official description
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.
[ Fixes ]Fixes and patches
- pypdf 6.18.1Fixed version · GitHub Advisories · pip package pypdf: upgrade to 6.18.1 or later (affected < 6.18.1)
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ Packages ]Affected open-source packages
- pypdf pipAffected < 6.18.1 · fixed in 6.18.1 · GHSA-fp3h-c4fm-7vvf