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[ CVE-2026-113791 · Published 21 Oct 2026 ]

pypdf: Possible large memory usage when parsing content streams

CVSS 6.0 EPSS <1%Fix available

[ Description ]Official description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.

[ Fixes ]Fixes and patches

  • pypdf 6.21.0Fixed version · GitHub Advisories · pip package pypdf: upgrade to 6.21.0 or later (affected < 6.21.0)

[ Packages ]Affected open-source packages

[ References ]References