CVE-2026-84361
Composer: Perforce source URL permits P4PORT `rsh:` command execution
- State
- Published
- Severity
- 7.7 High
- Published
- Sep 1, 2026
- Updated
- Sep 3, 2026
- Reserved
- Sep 1, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products
| Product | Versions |
|---|---|
composercomposer |
|
References
- https://github.com/composer/composer/security/advisories/GHSA-rvx4-ffvw-m9q3
- https://github.com/composer/composer/commit/0aac50528e83ed635cf788333635897469440220
- https://github.com/composer/composer/commit/199ad81a9cc6a2a5164ad79a8da26b2e19e521af
- https://github.com/composer/composer/releases/tag/2.10.3
- https://github.com/composer/composer/releases/tag/2.2.30
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