What’s Vulnerable › Vulnerabilities

CVE-2022-39288: Denial of service in Fastify via Content-Type header

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 59.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-10-10 · updated 2026-06-17
• Weakness: CWE-754

Description

fastify is a fast and low overhead web framework, for Node.js. Affected versions of fastify are subject to a denial of service via malicious use of the Content-Type header. An attacker can send an invalid Content-Type header that can cause the application to crash. This issue has been addressed in commit `fbb07e8d` and will be included in release version 4.8.1. Users are advised to upgrade. Users unable to upgrade may manually filter out http content with malicious Content-Type headers.

Affected products

• fastify: before 4.8.1 — fixed in 4.8.1

How to fix

Upgrade to a fixed version: fastify 4.8.1. Check the vendor advisory for mitigations.

References

• https://github.com/fastify/fastify/commit/fbb07e8dfad74c69cd4cd2211aedab87194618e3
• https://github.com/fastify/fastify/security/advisories/GHSA-455w-c45v-86rg
• https://github.com/fastify/fastify/security/policy
• https://github.com/fastify/fastify/commit/fbb07e8dfad74c69cd4cd2211aedab87194618e3
• https://github.com/fastify/fastify/security/advisories/GHSA-455w-c45v-86rg
• https://github.com/fastify/fastify/security/policy

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