p PatchFirst

CVE-2026-40176

CVE-2026-40176 · Composer is vulnerable to Command Injection via Malicious Perforce Repository

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Composer is a dependency manager for PHP. Versions 1.0 through 2.2.26 and 2.3 through 2.9.5 contain a command injection vulnerability in the Perforce::generateP4Command() method, which constructs shell commands by interpolating user-supplied Perforce connection parameters (port, user, client) without proper escaping. An attacker can inject arbitrary commands through these values in a malicious composer.json declaring a Perforce VCS repository, leading to command execution in the context of the user running Composer, even if Perforce is not installed. VCS repositories are only loaded from the root composer.json or the composer config directory, so this cannot be exploited through composer.json files of packages installed as dependencies. Users are at risk if they run Composer commands on untrusted projects with attacker-supplied composer.json files. This issue has been fixed in Composer 2.2.27 (2.2 LTS) and 2.9.6 (mainline).

CVSS 7.8 · High · EPSS 1.0% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • composer

    Versions
    • >= 2.3, < 2.9.6: Affected
    • >= 1.0, < 2.2.27: Affected

    No fix published

  • composer Debian:12

    Versions
    • 2.5.5-1
    • 2.5.5-1+deb12u1
    • 2.5.5-1+deb12u2
    • 2.5.5-1+deb12u3
    Affected ranges
    • ECOSYSTEM: < 2.5.5-1+deb12u4

    Update to 2.5.5-1+deb12u4

  • composer Debian:13

    Versions
    • 2.8.8-1
    • 2.8.8-1+deb13u1
    Affected ranges
    • ECOSYSTEM: < 2.8.8-1+deb13u2

    Update to 2.8.8-1+deb13u2

  • composer Debian:14

    Versions
    • 2.8.10-1
    • 2.8.11-1
    • 2.8.11-2
    • 2.8.12-1
    • 2.8.8-1
    • 2.8.9-1
    • 2.9.0~rc1-1
    • 2.9.1-1
    • 2.9.2-1
    • 2.9.3-1
    • 2.9.4-1
    • 2.9.5-1
    Affected ranges
    • ECOSYSTEM: < 2.9.7-1

    Update to 2.9.7-1

  • composer/composer Packagist

    Versions
    • 2.3.0
    • 2.3.1
    • 2.3.10
    • 2.3.2
    • 2.3.3
    • 2.3.4
    • 2.3.5
    • 2.3.6
    • 2.3.7
    • 2.3.8
    • 2.3.9
    • 2.4.0
    • 2.4.0-RC1
    • 2.4.1
    • 2.4.2
    • 2.4.3
    • 2.4.4
    • 2.5.0
    • 2.5.1
    • 2.5.2
    • 2.5.3
    • 2.5.4
    • 2.5.5
    • 2.5.6
    • 2.5.7
    • 2.5.8
    • 2.6.0
    • 2.6.1
    • 2.6.2
    • 2.6.3
    • 2.6.4
    • 2.6.5
    • 2.6.6
    • 2.7.0
    • 2.7.1
    • 2.7.2
    • 2.7.3
    • 2.7.4
    • 2.7.5
    • 2.7.6
    • 2.7.7
    • 2.7.8
    • 2.7.9
    • 2.8.0
    • 2.8.1
    • 2.8.10
    • 2.8.11
    • 2.8.12
    • 2.8.2
    • 2.8.3
    • 2.8.4
    • 2.8.5
    • 2.8.6
    • 2.8.7
    • 2.8.8
    • 2.8.9
    • 2.9.0
    • 2.9.0-RC1
    • 2.9.1
    • 2.9.2
    • 2.9.3
    • 2.9.4
    • 2.9.5
    Affected ranges
    • ECOSYSTEM: ≥ 2.3.0, < 2.9.6

    Update to 2.9.6

  • composer/composer Packagist

    Versions
    • 1.0.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.1.0
    • 1.1.0-RC
    • 1.1.1
    • 1.1.2
    • 1.1.3
    • 1.10.0
    • 1.10.0-RC
    • 1.10.1
    • 1.10.10
    • 1.10.11
    • 1.10.12
    • 1.10.13
    • 1.10.14
    • 1.10.15
    • 1.10.16
    • 1.10.17
    • 1.10.18
    • 1.10.19
    • 1.10.2
    • 1.10.20
    • 1.10.21
    • 1.10.22
    • 1.10.23
    • 1.10.24
    • 1.10.25
    • 1.10.26
    • 1.10.27
    • 1.10.28
    • 1.10.3
    • 1.10.4
    • 1.10.5
    • 1.10.6
    • 1.10.7
    • 1.10.8
    • 1.10.9
    • 1.2.0
    • 1.2.0-RC
    • 1.2.1
    • 1.2.2
    • 1.2.3
    • 1.2.4
    • 1.3.0
    • 1.3.0-RC
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.4.0
    • 1.4.1
    • 1.4.2
    • 1.4.3
    • 1.5.0
    • 1.5.1
    • 1.5.2
    • 1.5.3
    • 1.5.4
    • 1.5.5
    • 1.5.6
    • 1.6.0
    • 1.6.0-RC
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.6.4
    • 1.6.5
    • 1.7.0
    • 1.7.0-RC
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.8.0
    • 1.8.1
    • 1.8.2
    • 1.8.3
    • 1.8.4
    • 1.8.5
    • 1.8.6
    • 1.9.0
    • 1.9.1
    • 1.9.2
    • 1.9.3
    • 2.0.0
    • 2.0.0-RC1
    • 2.0.0-RC2
    • 2.0.0-alpha1
    • 2.0.0-alpha2
    • 2.0.0-alpha3
    • 2.0.1
    • 2.0.10
    • 2.0.11
    • 2.0.12
    • 2.0.13
    • 2.0.14
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.0.9
    • 2.1.0
    • 2.1.0-RC1
    • 2.1.1
    • 2.1.10
    • 2.1.11
    • 2.1.12
    • 2.1.14
    • 2.1.2
    • 2.1.3
    • 2.1.4
    • 2.1.5
    • 2.1.6
    • 2.1.7
    • 2.1.8
    • 2.1.9
    • 2.2.0
    • 2.2.0-RC1
    • 2.2.1
    • 2.2.10
    • 2.2.11
    • 2.2.12
    • 2.2.13
    • 2.2.14
    • 2.2.15
    • 2.2.16
    • 2.2.17
    • 2.2.18
    • 2.2.19
    • 2.2.2
    • 2.2.20
    • 2.2.21
    • 2.2.22
    • 2.2.23
    • 2.2.24
    • 2.2.25
    • 2.2.26
    • 2.2.3
    • 2.2.4
    • 2.2.5
    • 2.2.6
    • 2.2.7
    • 2.2.8
    • 2.2.9
    Affected ranges
    • ECOSYSTEM: ≥ 1.0.0, < 2.2.27

    Update to 2.2.27

  • composer Ubuntu:Pro:16.04:LTS

    Versions
    • 1.0.0~alpha10+20150602-1
    • 1.0.0~alpha10+20150602-2
    • 1.0.0~alpha11-1
    • 1.0.0~alpha11-1ubuntu1
    • 1.0.0~alpha11-2
    • 1.0.0~alpha11-3
    • 1.0.0~beta1-1ubuntu1
    • 1.0.0~beta2-1
    • 1.0.0~beta2-1ubuntu0.1~esm1
    • 1.0.0~beta2-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:Pro:18.04:LTS

    Versions
    • 1.5.1-1
    • 1.5.2-1
    • 1.6.2-1
    • 1.6.3-1
    • 1.6.3-1ubuntu0.1~esm1
    • 1.6.3-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:Pro:20.04:LTS

    Versions
    • 1.9.0-2
    • 1.9.1-1
    • 1.9.2-1
    • 1.9.3-1
    • 1.10.0-1
    • 1.10.1-1
    • 1.10.1-1ubuntu0.1~esm1
    • 1.10.1-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:Pro:22.04:LTS

    Versions
    • 2.0.9-2ubuntu2
    • 2.0.9-2ubuntu3
    • 2.0.13-1ubuntu1
    • 2.1.12-1ubuntu1
    • 2.2.6-2ubuntu4
    • 2.2.6-2ubuntu4+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:Pro:24.04:LTS

    Versions
    • 2.5.8-1
    • 2.6.5-1
    • 2.6.6-1
    • 2.7.1-2
    • 2.7.1-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:25.10

    Versions
    • 2.8.6-1
    • 2.8.8-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:26.10

    Versions
    • 2.9.5-1
    • 2.10.1-2
    • 2.10.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • composer Ubuntu:26.04:LTS

    Versions
    • 2.8.8-1
    • 2.9.5-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →