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[ CVE-2026-113792 · Published 21 Oct 2026 ]

pypdf: Possible infinite loop in PdfWriter.find_outline_item

CVSS 6.0 EPSS <1%Fix available

[ Description ]Official description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.

[ Fixes ]Fixes and patches

  • pypdf 6.20.1Fixed version · GitHub Advisories · pip package pypdf: upgrade to 6.20.1 or later (affected < 6.20.1)

[ Packages ]Affected open-source packages

[ References ]References