PatchTheCVEfastify\/express vulnerabilities and fixes
Recent CVEs affecting fastify\/express, with upgrade or downgrade steps. 2 tracked.
fastify\/express has 2 tracked vulnerabilities, 2 critical. A fixed release or vendor patch exists for 2. Most recent: 2026-04-15. Highest priority: CVE-2026-33808 (score 52/100).
- CVE-2026-33808 CRITICAL 9.1 UPGRADE Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware wh
- CVE-2026-33807 CRITICAL 9.1 UPGRADE @fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middle
FAQ
How do I fix fastify\/express 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\/express being exploited right now?
None of the tracked fastify\/express CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which fastify\/express CVE should I patch first?
CVE-2026-33808 currently ranks highest (52/100): Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware wh.