Vulnerability-Lookup

CVE-2026-46420 (GCVE-0-2026-46420)

Vulnerability from cvelistv5 – Published: 2026-07-17 19:51 – Updated: 2026-07-20 18:15

Title

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

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.

Severity

5.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-20 18:09 UTC

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/shivammathur/setup-php/securit…	x_refsource_CONFIRM
https://github.com/shivammathur/setup-php/commit/…	x_refsource_MISC
https://github.com/shivammathur/setup-php/release…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
shivammathur	setup-php	Affected: >= 2.25.0, < 2.37.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-46420

Vulnerability from fkie_nvd - Published: 2026-07-17 20:17 - Updated: 2026-08-18 15:54

Severity

5.6 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/shivammathur/setup-php/commit/eeef37e059fb5368a5bc8ed8ce45ff54bd39b80b	Patch
security-advisories@github.com	https://github.com/shivammathur/setup-php/releases/tag/2.37.1	Product, Release Notes
security-advisories@github.com	https://github.com/shivammathur/setup-php/security/advisories/GHSA-pqwm-q9pv-ph8r	Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	shivammathur	setup_php	*

JSON

To clipboard

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          "product": "setup-php",
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GHSA-PQWM-Q9PV-PH8R

Vulnerability from github – Published: 2026-05-20 15:31 – Updated: 2026-05-20 15:31

Summary

Setup PHP: Command Injection in Repository-Derived PHP Version Resolution

Details

Summary

A command injection vulnerability was identified in shivammathur/setup-php when the action resolves the PHP version from repository-controlled files and uses that value while generating the platform setup script.

In affected versions, setup-php may read the PHP version from:

.php-version
composer.lock via platform-overrides.php
composer.json via config.platform.php

If an attacker can influence one of these files and the workflow executes setup-php in a trusted context, they may be able to execute commands on the GitHub Actions runner.

Impact

This issue is exploitable when setup-php is run after checking out attacker-controlled repository contents and resolves the PHP version from repository files.

The most significant example is a privileged workflow such as pull_request_target that checks out untrusted pull request code before invoking setup-php. Similar risk can also arise in other workflows that operate on attacker-controlled refs, branches, or repository contents in a trusted context.

This is not a separate security boundary when an attacker can already modify the workflow definition itself or directly control the php-version workflow input, since that level of access already permits arbitrary command execution in GitHub Actions.

Technical details

In affected versions, repository-derived PHP version values were insufficiently constrained before being incorporated into the generated shell or PowerShell setup script executed by the action. This could allow attacker-controlled values from supported repository files to influence script execution in trusted workflow contexts.

Remediation

If you are using shivammathur/setup-php@v2, no action is needed on your end. Users who pin the setup-php release version or release version SHA should upgrade to a patched version.

The fix validates PHP version inputs, constrains manifest-derived versions, hardens script generation at the execution, and includes additional checks in related input-handling paths.

Severity

5.6 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "GitHub Actions",
        "name": "shivammathur/setup-php"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.25.0"
            },
            {
              "fixed": "2.37.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46420"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-20T15:31:52Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nA command injection vulnerability was identified in `shivammathur/setup-php` when the action resolves the PHP version from repository-controlled files and uses that value while generating the platform setup script.\n\nIn affected versions, `setup-php` may read the PHP version from:\n\n- `.php-version`\n- `composer.lock` via `platform-overrides.php`\n- `composer.json` via `config.platform.php`\n\nIf an attacker can influence one of these files and the workflow executes `setup-php` in a trusted context, they may be able to execute commands on the GitHub Actions runner.\n\n### Impact\n\nThis issue is exploitable when `setup-php` is run after checking out attacker-controlled repository contents and resolves the PHP version from repository files.\n\nThe most significant example is a privileged workflow such as `pull_request_target` that checks out untrusted pull request code before invoking `setup-php`. Similar risk can also arise in other workflows that operate on attacker-controlled refs, branches, or repository contents in a trusted context.\n\nThis is not a separate security boundary when an attacker can already modify the workflow definition itself or directly control the `php-version` workflow input, since that level of access already permits arbitrary command execution in GitHub Actions.\n\n### Technical details\n\nIn affected versions, repository-derived PHP version values were insufficiently constrained before being incorporated into the generated shell or PowerShell setup script executed by the action. This could allow attacker-controlled values from supported repository files to influence script execution in trusted workflow contexts.\n\n### Remediation\n\nIf you are using `shivammathur/setup-php@v2`, no action is needed on your end. Users who pin the setup-php release version or release version SHA should upgrade to a patched version.\n\nThe fix validates PHP version inputs, constrains manifest-derived versions, hardens script generation at the execution, and includes additional checks in related input-handling paths.",
  "id": "GHSA-pqwm-q9pv-ph8r",
  "modified": "2026-05-20T15:31:52Z",
  "published": "2026-05-20T15:31:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/shivammathur/setup-php/security/advisories/GHSA-pqwm-q9pv-ph8r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/shivammathur/setup-php/commit/eeef37e059fb5368a5bc8ed8ce45ff54bd39b80b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/shivammathur/setup-php"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Setup PHP: Command Injection in Repository-Derived PHP Version Resolution"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-46420 (GCVE-0-2026-46420)

FKIE_CVE-2026-46420

GHSA-PQWM-Q9PV-PH8R

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