fastify-multipart vulnerabilities and fixes

Recent CVEs affecting fastify-multipart, with upgrade or downgrade steps. 2 tracked.

Also searched as: fastify multipart.

fastify-multipart has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 2. Most recent: 2026-08-15. Highest priority: CVE-2026-18549 (score 43/100).

• CVE-2026-18549 HIGH 7.5 UPGRADE @fastify/multipart is a multipart form-data parser for Fastify
• CVE-2026-19474 HIGH 7.5 UPGRADE @fastify/multipart is a multipart form-data parser for Fastify

FAQ

How do I fix fastify-multipart 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 fastify-multipart being exploited right now?

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

Which fastify-multipart CVE should I patch first?

CVE-2026-18549 currently ranks highest (43/100): @fastify/multipart is a multipart form-data parser for Fastify.

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