Nixpkgs security tracker

Untriaged

Permalink CVE-2026-4224

created 4 weeks ago

Stack overflow parsing XML with deeply nested DTD content models

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

References

https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf5327… patch
https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CG… vendor-advisory
https://github.com/python/cpython/issues/145986 issue-tracking
https://github.com/python/cpython/pull/145987 patch
https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd… patch
https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1… patch
http://www.openwall.com/lists/oss-security/2026/03/16/4

Affected products

CPython

<3.15.0

Matching in nixpkgs

pkgs.haskellPackages.cpython

Bindings for libpython

nixos-unstable 3.9.0
- nixpkgs-unstable 3.9.0
- nixos-unstable-small 3.9.0
nixos-25.11 3.9.0
- nixos-25.11-small 3.9.0
- nixpkgs-25.11-darwin 3.9.0

Package maintainers

@sheepforce Phillip Seeber <phillip.seeber@googlemail.com>

Suggestion detail

References

Affected products

Matching in nixpkgs

pkgs.haskellPackages.cpython

Package maintainers