Description
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 products
shivammathur: setup php
References3
- github.com/shivammathur/setup-php/security/advisories/GHSA-pqwm… PatchVendor Advisory
- github.com/shivammathur/setup-php/commit/eeef37e059fb5368a5bc8e… Patch
- github.com/shivammathur/setup-php/releases/tag/2.37.1 ProductRelease Notes
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 2% percentile: 81 · as of 14 November 2026
- CWE
- CWE-78
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