Nixpkgs security tracker

Untriaged

Permalink CVE-2026-4786

created 20 hours ago

Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

References

https://github.com/python/cpython/pull/148170 patch
https://github.com/python/cpython/issues/148169 issue-tracking
https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUN… vendor-advisory

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