@fastify/accepts-serializer vulnerabilities

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• @fastify/accepts-serializer 1

Latest @fastify/accepts-serializer CVEs

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1. CVE-2026-7768 @fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth

   Published 2026-05-04

   High·CVSS 7.5 EPSS 0.28%

   @fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded, eventually ex...

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.