CVE-2026-7768 — @fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
@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…
Published: 2026-05-04 · CVSS: 7.5 · CVSS 3.1
@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 exhausting the Node.js heap and crashing the process. Versions <= 6.0.3 are affected. Update to 6.0.4 or later, which bounds the cache via an LRU with a default size of 100 entries, configurable through the new cacheSize plugin option.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7