Nixpkgs Security Tracker

Permalink CVE-2026-27026

created 2 weeks ago

pypdf possibly has long runtimes for malformed FlateDecode streams

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/3644 x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016 x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.7.1 x_refsource_MISC

Affected products

pypdf

==< 6.7.1

Matching in nixpkgs

pkgs.capypdf

Fully color managed PDF generation library

nixos-unstable 0.20.0
- nixpkgs-unstable 0.20.0
- nixos-unstable-small 0.20.0
nixos-25.11 0.18.0
- nixos-25.11-small 0.18.0
- nixpkgs-25.11-darwin 0.18.0

pkgs.python312Packages.pypdf

Pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files

nixos-25.11 6.6.0
- nixos-25.11-small 6.6.0
- nixpkgs-25.11-darwin 6.6.0

pkgs.python313Packages.pypdf

Pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files

nixos-unstable 6.7.0
- nixpkgs-unstable 6.7.0
- nixos-unstable-small 6.7.0
nixos-25.11 6.6.0
- nixos-25.11-small 6.6.0
- nixpkgs-25.11-darwin 6.6.0

pkgs.python314Packages.pypdf

Pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files

nixos-unstable 6.7.0
- nixpkgs-unstable 6.7.0
- nixos-unstable-small 6.7.0

pkgs.python312Packages.pypdf2

Pure-Python library built as a PDF toolkit

nixos-25.11 pypdf2-3.0.1
- nixos-25.11-small pypdf2-3.0.1
- nixpkgs-25.11-darwin pypdf2-3.0.1

pkgs.python312Packages.pypdf3

Pure-Python library built as a PDF toolkit

nixos-25.11 pypdf3-1.0.6
- nixos-25.11-small pypdf3-1.0.6
- nixpkgs-25.11-darwin pypdf3-1.0.6

pkgs.python313Packages.pypdf2

Pure-Python library built as a PDF toolkit

nixos-unstable pypdf2-3.0.1
- nixpkgs-unstable pypdf2-3.0.1
- nixos-unstable-small pypdf2-3.0.1
nixos-25.11 pypdf2-3.0.1
- nixos-25.11-small pypdf2-3.0.1
- nixpkgs-25.11-darwin pypdf2-3.0.1

pkgs.python313Packages.pypdf3

Pure-Python library built as a PDF toolkit

nixos-unstable pypdf3-1.0.6
- nixpkgs-unstable pypdf3-1.0.6
- nixos-unstable-small pypdf3-1.0.6
nixos-25.11 pypdf3-1.0.6
- nixos-25.11-small pypdf3-1.0.6
- nixpkgs-25.11-darwin pypdf3-1.0.6