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CVE-2026-46420

CriticalPublished

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

Published: Jul 17, 2026
Updated: Jul 20, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 17, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

1.5%

Low · next 30 days

Percentile: 73.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-46420PoC
PoC for CVE-2026-46420, command injection in shivammathur/setup-php via repository-controlled PHP version resolution.

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