Command Injection Affecting setup-php package, versions >=2.25.0 <2.37.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SETUPPHP-16874161
- published25 May 2026
- disclosed20 May 2026
- creditUnknown
Introduced: 20 May 2026
CVE-2026-46420 (opens in a new tab)How to fix?
Upgrade setup-php to version 2.37.1 or higher.
Overview
setup-php is a Setup PHP for use with GitHub Actions
Affected versions of this package are vulnerable to Command Injection via the process that resolves PHP version from repository-controlled files such as .php-version, composer.lock, or composer.json and incorporates the value into the generated setup script. An attacker can execute arbitrary commands on the GitHub Actions runner by injecting malicious values into these files when the workflow runs in a trusted context after checking out attacker-controlled repository contents. This is only exploitable if the workflow executes after checking out untrusted code and resolves the PHP version from repository files in a privileged context.