CVE-2026-40176
An attacker can exploit multiple vulnerabilities in Composer to execute arbitrary program code.
CSIRTS triage
- What
- Multiple vulnerabilities allow arbitrary code execution.
- Who is affected
- Attackers targeting installations of Composer.
- Urgency
- Remediation is high urgency due to the potential for severe impacts.
- Action
- Update to the latest version of Composer.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk1.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all EPSS-scored CVEs.
Advisory coverage (2)
- high[UPDATE] [high] Composer: Multiple vulnerabilities allow code executioncert-bund · 2026-07-20
- highGHSA-wg36-wvj6-r67p: Composer has a command injection via malicious perforce repositoryghsa · 2026-04-14
External references
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[](https://www.csirts.com/cve/CVE-2026-40176)