CVE-2026-7768
@fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
- State
- Published
- Severity
- 7.5 High
- Published
- May 4, 2026
- Updated
- May 4, 2026
- Reserved
- May 4, 2026
Description
@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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | openjs |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
@fastify/accepts-serializer@fastify/accepts-serializer |
|
References
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