CVE-2026-46420: medium-severity vulnerability in shivammathur setup-php
setup-php: Command Injection in Repository-Derived PHP Version Resolution
Published · Updated
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33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 5.6epss 2.0%
from disclosure to weapon1 day
Published on NVDJul 17
1st PoC+1d
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
shivammathur · setup-phppublic PoCs found — 1
githubgithub.com/Jvr2022/CVE-2026-46420★ 1⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.