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[ CVE-2026-102998 · Published 30 Sep 2026 ]

pypdf: Possible long runtimes when generating appearance streams

CVSS 7.5 EPSS <1%1 agency advisoryFix available

[ Description ]Official description

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.

[ Fixes ]Fixes and patches

  • pypdf 6.19.0Fixed version · GitHub Advisories · pip package pypdf: upgrade to 6.19.0 or later (affected < 6.19.0)
  • 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

[ Advisories ]Government CERT advisories

[ Packages ]Affected open-source packages

[ References ]References