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CVE-2026-46420

MEDIUM
5.6
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-46420
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-13 22:18 UTC
Published
2026-07-17 19:51 UTC
Last updated
2026-07-17 19:51 UTC
Primary CWE
CWE-78
CWE-78: Improper Neutralization of Special Elements used in …
Vendor / Product
shivammathur / setup-php
Sources
cve.org  ·  NVD

Severity & Metrics

5.6 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products (1)
VendorProductPlatformVersions
shivammathur setup-php — >= 2.25.0, < 2.37.1
Weakness (CWE)
CWESourceDescription
CWE-78 cna CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.6 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
References (3)
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