CVE catalog
CVE-2026-25223
Fastify's Content-Type header tab character allows body validation bypass
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.88% · Oct 25, 2026
A flaw was found in Fastify, a web framework for Node.js. A remote attacker can exploit a validation bypass vulnerability by appending a tab character followed by arbitrary content to the Content-Type header. This circumvents the request body validation schemas, allowing the server to process the body as the original content type without proper validation. This could lead to unexpected data processing and potential integrity impact. Fastify: Fastify: Validation bypass due to malformed Content-Type header leading to integrity impact This IMPORTANT vulnerability in Fastify, a Node.js web framework, allows remote attackers to bypass request body validation by manipulating the Content-Type header. This can lead to unexpected data processing and integrity issues in applications. Red Hat products such as Red Hat Enterprise Linux AI, Red Hat OpenShift AI, and Red Hat OpenShift Dev Spaces are affected. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Npm | fastify | Not reported | 5.7.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Npm | fastify | npm | Not reported | 5.7.2 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: