CVE-2026-40176Composer is a dependency manager for PHP.
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No exploitation reported and no EPSS estimate yet.
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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 (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-20, CWE-78
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
getcomposer composer getcomposer:composer | from 1.0.0 through 2.2.26; from 2.3.0 through 2.9.5 | NVD |
References
- https://github.com/composer/composer/releases/tag/2.9.6release-notes
- https://github.com/composer/composer/security/advisories/GHSA-wg36-wvj6-r67pvendor-advisory
- 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://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40176.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.