CVE-2026-40261
unknown
CVSS v3
—
CVSS v4 NEW
—
VIR risk
—
Description
Composer has a command injection via malicious perforce reference
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 2.5.5-1+deb12u4 |
| debian | bullseye | affected | |
| debian | forky | fixed | 2.9.7-1 |
| debian | sid | fixed | 2.9.7-1 |
| debian | trixie | fixed | 2.8.8-1+deb13u2 |
| sles | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | composer/composer | >=2.3.0,<2.9.6 | 2.9.6 |
| Packagist | composer/composer | >=1.0.0,<2.2.27 | 2.2.27 |
References
- https://security-tracker.debian.org/tracker/CVE-2026-40261
- https://www.suse.com/security/cve/CVE-2026-40261.html
- https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
- https://nvd.nist.gov/vuln/detail/CVE-2026-40261
- https://github.com/FriendsOfPHP/security-advisories/blob/master/composer/composer/CVE-2026-40261.yaml
- https://github.com/composer/composer
- https://github.com/composer/composer/releases/tag/2.9.6
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.