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CVE-2026-46420setup-php: Command Injection in Repository-Derived PHP Version Resolution
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.
9.8 CRITICALEPSS 2.01%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 5.6 | MEDIUM | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L |
Details
- CVE ID
- CVE-2026-46420
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 17, 2026
- Last modified
- 2026-10-24 20:10 UTC
- Weaknesses
- CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products
As published by the CNA in the CVE record.
shivammathursetup-php1 version range
- >= 2.25.0, < 2.37.1