CVE-2026-40176 | BDVDB-2026-327296 Detail
composercomposer
Description#
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).
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: local.
Weaknesses#
References#
- https://github.com/composer/composer/security/advisories/GHSA-wg36-wvj6-r67p
- https://access.redhat.com/errata/RHSA-2026:8165
- https://access.redhat.com/security/cve/CVE-2026-40176
- https://bugzilla.redhat.com/show_bug.cgi?id=2458828
- https://github.com/FriendsOfPHP/security-advisories/blob/master/composer/composer/CVE-2026-40176.yaml
- https://github.com/composer/composer/releases/tag/2.2.27
- https://github.com/composer/composer/releases/tag/2.9.6
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40176.json
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.