composer vulnerabilities and fixes

Recent CVEs affecting composer, with upgrade or downgrade steps. 2 tracked.

composer has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 2. Most recent: 2026-04-15. Highest priority: CVE-2026-40261 (score 50/100).

• CVE-2026-40261 HIGH 8.8 UPGRADE Composer is a dependency manager for PHP
• CVE-2026-40176 HIGH 7.8 UPGRADE Composer is a dependency manager for PHP

FAQ

How do I fix composer vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is composer being exploited right now?

None of the tracked composer CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which composer CVE should I patch first?

CVE-2026-40261 currently ranks highest (50/100): Composer is a dependency manager for PHP.

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