CVE-2026-46420
setup-php: Command Injection in Repository-Derived PHP Version Resolution
CRITICAL 9.8EPSS 2.0%
setup-php is a GitHub action to set up PHP with extensions, php.ini configuration, coverage drivers, and tools. From 2.25.0 prior to 2.37.1, shivammathur/setup-php resolves the PHP version from repository-controlled files such as .php-version, composer.lock through platform-overrides.php, and composer.json through config.platform.php, and insufficiently constrains those values before incorporating them into generated shell or PowerShell setup scripts, allowing command injection on a GitHub Actions runner when workflows such as pull_request_target check out attacker-controlled contents before invoking setup-php. This issue is fixed in version 2.37.1.
- Affected
- shivammathur · setup-php
- CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1 GITHUB
- 5.6 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - EPSS
- 2.01% chance of exploitation in the next 30 days, 81st percentile
- Published
- 2026-07-17
- Updated
- 2026-07-20
Proof-of-concept exploits (1)
- Jvr2022/CVE-2026-464201★ · 2026-07-18
Security advisories
- shivammathur/setup-php/security/advisories/GHSA-pqwm-q9pv-ph8r
- advisories/GHSA-pqwm-q9pv-ph8r
- shivammathur/setup-php/commit/eeef37e059fb5368a5bc8ed8ce45ff54bd39b80b