@fastify/rate-limit vulnerabilities

Products

• @fastify/rate-limit 1

Latest @fastify/rate-limit CVEs

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1. CVE-2026-15144 @fastify/rate-limit vulnerable to rate-limit bypass via IPv6 address rotation

   Published 2026-07-29

   Medium·CVSS 5.3 EPSS 0.40%

   @fastify/rate-limit before 11.2.0 keys rate-limit buckets by the verbatim client IP string returned from request.ip. Because a single IPv6 client can control a large address range (a /64 holds 2^64 distinct addresses) and the same address has multiple valid textual representation...

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.