[ CVE-2026-119206 · Published 29 Oct 2026 ]
pypdf has possible long runtimes when retrieving page labels
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 take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. 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
- pypdf pipAffected < 6.21.3 · fixed in 6.21.3 · GHSA-42gh-23hr-vphw