CVE-2022-39288 Denial of service in Fastify via Content-Type header
An attacker can crash a Fastify application by sending a malicious Content-Type header, requiring an upgrade to the latest version.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-39288?
CVE-2022-39288 is a high-severity denial of service vulnerability in fastify, published on 10 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-754
Which versions are affected by CVE-2022-39288?
2 open source packages ship an affected version, including fastify. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fastify npm | From 4.0.0 | 4.8.1 |
fastify npm | From 4.0.0 | 4.8.1 |
Products include Fastify Fastify.
How do I fix CVE-2022-39288?
Upgrade fastify to 4.8.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-39288 being exploited?
There is no known exploitation of CVE-2022-39288 in the wild and no public exploit code.
Other vulnerabilities in fastify
- CVE-2026-84504 fastify vulnerable to request body replacement via an async validation result collision
- CVE-2026-76169 fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers
- CVE-2026-84428 fastify vulnerable to header validation bypass via incomplete schema case normalization
- CVE-2026-84469 fastify vulnerable to request validation bypass via skipped boolean false schemas
- CVE-2026-33806 fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header
Sources
Also known as GHSA-455w-c45v-86rg.