How severe is CVE-2026-7768?

CVE-2026-7768 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-7768 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-7768?

CVE-2026-7768 affects Fastify Fastify/accepts-serializer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-7768?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-7768 have an EU (EUVD) identifier?

Yes. CVE-2026-7768 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27131.

When was CVE-2026-7768 published?

CVE-2026-7768 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-7768

CVE-2026-7768 is a high-severity vulnerability in Fastify Fastify/accepts-serializer with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27131
Weakness: CWE-770
Affected product: Fastify Fastify/accepts-serializer
Published: 2026-05-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-7768?: CVE-2026-7768 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-7768 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-7768?: CVE-2026-7768 affects Fastify Fastify/accepts-serializer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-7768?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-7768 have an EU (EUVD) identifier?: Yes. CVE-2026-7768 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27131.
When was CVE-2026-7768 published?: CVE-2026-7768 was published on 2026-05-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fastify:fastify\/accepts-serializer:*:*:*:*:*:node.js:*:*

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