high7.5
CVE-2026-7768
@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy.
Impact
@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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @fastify/accepts-serializer | <= 6.0.3 | 6.0.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Fastify | Fastify\/Accepts-Serializer | before 6.0.4 |