highCVSS 7.5Vulnerability
CVE-2026-7768
### 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. Under sustained load, this can exhaust the Node.js heap and crash the process. ### Patches Update to `@fastify/accepts-serializer >= 6.0.4`. The cache is now bounded by an LRU with a default size of 100 entries, configurable via the new `cacheSize` plugin option. ### Workarounds None. Upgrade is required.
Properties
- severity
- high
- summary
- @fastify/accepts-serializer Vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
- epss_score
- 0.00284
- cvss_score
- 7.5
- ghsa_published
- 2026-05-08T17:13:38Z
- source_url
- https://github.com/advisories/GHSA-qxhc-wx3p-2wmg
- ghsa_updated
- 2026-05-08T17:13:38Z
- ghsa_id
- GHSA-qxhc-wx3p-2wmg
- cve_id
- CVE-2026-7768
- cvss_vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- signal_observed_at
- 2026-09-11T17:55:57+00:00
- is_ghsa_only
- false
- epss_percentile
- 0.21196
Related Entities (5)
ENRICHED_BY (1)
→[Source]FIRST EPSS
VULNERABLE_TO (1)
←[Software]npm/@fastify/accepts-serializer
AFFECTS (1)
→[Software]npm/@fastify/accepts-serializer
HAS_WEAKNESS (1)
→[Weakness]Allocation of Resources Without Limits or Throttling
REPORTED_BY (1)
→[Source]GitHub Advisory Database
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