VULNERABILITY INTELLIGENCE

CVE-2026-25223

CVSS score7.5 HIGH
EPSS probability0.86%
CISA KEVNot currently listed
Published2026-02-03
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-436
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-179

Primary references