CVE-2026-59947
A remote, anonymous attacker can exploit multiple vulnerabilities in Composer to bypass security mechanisms, write arbitrary files, or disclose information. Certain configurations may be required for successful exploitation.
CSIRTS triage
- What
- Multiple vulnerabilities allow a remote attacker to bypass security mechanisms, write arbitrary files, or disclose information.
- Who is affected
- Users of Composer are affected, especially with certain configurations.
- Urgency
- Remediation is medium urgency due to the nature of the vulnerabilities.
- 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
- Low exploitation risk0.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
Advisory coverage (2)
- medium[NEW] [medium] Composer: Multiple vulnerabilitiescert-bund · 2026-07-09
- mediumCVE-2026-59947: Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, when Compos…nvd · 2026-07-08
External references
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[](https://www.csirts.com/cve/CVE-2026-59947)