Vulnerability Details CVE-2026-7768
@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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.7%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-7768
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cpe:2.3:a:fastify:fastify/accepts-serializer:0.1.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:0.2.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:0.2.1
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cpe:2.3:a:fastify:fastify/accepts-serializer:1.0.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:1.0.1
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cpe:2.3:a:fastify:fastify/accepts-serializer:1.0.2
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cpe:2.3:a:fastify:fastify/accepts-serializer:2.0.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:2.0.1
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cpe:2.3:a:fastify:fastify/accepts-serializer:2.0.2
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cpe:2.3:a:fastify:fastify/accepts-serializer:3.0.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:3.0.1
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cpe:2.3:a:fastify:fastify/accepts-serializer:3.1.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:3.2.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:4.0.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:4.0.1
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cpe:2.3:a:fastify:fastify/accepts-serializer:5.0.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:5.1.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:5.2.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:5.3.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:6.0.0
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cpe:2.3:a:fastify:fastify/accepts-serializer:6.0.1
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cpe:2.3:a:fastify:fastify/accepts-serializer:6.0.2
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cpe:2.3:a:fastify:fastify/accepts-serializer:6.0.3