CVE-2026-46420

MEDIUM 5.6

setup-php: Command Injection in Repository-Derived PHP Version Resolution

CVSS Score

5.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78
Vendor	shivammathur
Product	setup-php
Published	Jul 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

shivammathur / setup-php

>= 2.25.0, < 2.37.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/shivammathur/setup-php/security/advisories/GHSA-pqwm-q9pv-ph8r github.com: https://github.com/shivammathur/setup-php/commit/eeef37e059fb5368a5bc8ed8ce45ff54bd39b80b github.com: https://github.com/shivammathur/setup-php/releases/tag/2.37.1