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[ CVE-2026-102996 · Published 30 Sep 2026 ]

pypdf: Possible large memory usage when parsing font data

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 provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a simple font and consume excessive memory during operations such as text extraction. 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

[ References ]References