CVE-2026-7768

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.

PUBLISHED Reserved 2026-05-04 | Published 2026-05-04 | Updated 2026-05-04 | Assigner openjs

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

Credits

Yuki Matsuhashi finder

Ulises Gascón remediation reviewer

Manuel Spigolon remediation developer

References

cna.openjsf.org/security-advisories.html

github.com/...alizer/security/advisories/GHSA-qxhc-wx3p-2wmg

cve.org (CVE-2026-7768)

nvd.nist.gov (CVE-2026-7768)

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