composer: Composer is a dependency Manager for the PHP language
CVE-2026-84361 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-84361, released September 3, 2026. It is not reported as exploited. Patch Radar priority: High.
Composer is a dependency Manager for the PHP language. From 1.0 until 2.2.30 and 2.10.3, a malicious dependency package from a custom Composer repository or an untrusted composer.lock file could set source.type to perforce and source.url to an rsh: or jsh: P4PORT value. When the Perforce p4 client was installed and Composer installed the package from source through composer install or composer update, including --prefer-source, Composer\Util\Perforce passed the address to p4 without validation, causing p4 to run a local command with the privileges of the user or CI account. Packagist.org does not permit Perforce source metadata. This issue is fixed in versions 2.2.30 and 2.10.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| composer · Debian 14 | 2.10.3-1 | DEBIAN-CVE-2026-84361 | Sep 3, 2026 |
| composer · amzn 2023 | 2.10.3-1.amzn2023.0.1 | ALAS2023-2026-3136 | Sep 28, 2026 |
| php-composer2 · opensuse-leap 16.0 | 2.8.9-160000.5.1 | OPENSUSE-SU-2026:21778-1 | Sep 6, 2026 |
| php-composer2 · sles 15.6 | 2.6.4-150600.3.18.1 | SUSE-SU-2026:4059-1 | Sep 8, 2026 |
| php-composer2 · sles 15.7 | 2.6.4-150600.3.18.1 | SUSE-SU-2026:4059-1 | Sep 8, 2026 |
| php-composer2 · sles 16.0 | 2.8.9-160000.5.1 | SUSE-SU-2026:23635-1 | Sep 6, 2026 |
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