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[ CVE-2026-115580 · Published 23 Oct 2026 ]

pypdf: Possible long runtimes for large xref table header limits

CVSS 7.1 EPSS <1%Fix available

[ Description ]Official description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.

[ Fixes ]Fixes and patches

  • pypdf 6.21.2Fixed version · GitHub Advisories · pip package pypdf: upgrade to 6.21.2 or later (affected < 6.21.2)

[ Packages ]Affected open-source packages

[ References ]References