CVE-2026-25223

7.5 HIGH
Published: February 03, 2026 Modified: February 10, 2026
View on NVD

Description

Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
Source: security-advisories@github.com
Product Technical Description
https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
Source: security-advisories@github.com
Vendor Advisory Mitigation
https://hackerone.com/reports/3464114
Source: security-advisories@github.com
Permissions Required

6 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
0.0%
5th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

fastify