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[ CVE-2026-119208 · Published 29 Oct 2026 ]

pypdf has possible long runtimes/large memory usage for encrypted PDF files

CVSS 5.5 EPSS <1%Fix available

[ Description ]Official description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive time and memory when an application accesses the page count of a crafted encrypted PDF whose page tree declares a forged /Count value. Even after successful decryption, page-count retrieval trusts the unvalidated declared count instead of walking the page tree, allowing the attacker-controlled value to drive excessive work and memory use. This issue is fixed in version 6.21.3.

[ Fixes ]Fixes and patches

  • pypdf 6.21.3Fixed version · GitHub Advisories · pip package pypdf: upgrade to 6.21.3 or later (affected < 6.21.3)
  • 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
  • Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Packages ]Affected open-source packages

[ References ]References