CVE-2026-59946

Name	CVE-2026-59946
Description	Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. This issue is fixed in versions 2.2.29 and 2.10.2.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
composer (PTS)	bullseye (security), bullseye	2.0.9-2+deb11u4	vulnerable
	bookworm	2.5.5-1+deb12u4	vulnerable
	bookworm (security)	2.5.5-1+deb12u2	vulnerable
	trixie	2.8.8-1+deb13u2	vulnerable
	forky, sid	2.10.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
composer	source	(unstable)	2.10.2-1

Notes

[trixie] - composer <no-dsa> (Minor issue)
https://github.com/composer/composer/security/advisories/GHSA-gjfg-22fp-rrxx
Fixed by: https://github.com/composer/composer/commit/502c6c4f699802d9cf464728b3e8a95674f919a0 (2.10.2)
Fixed by: https://github.com/composer/composer/commit/c50b1efd13ebd73f6dca19b31424c5a02bf93cc1 (2.2.29)