CVE-2026-25223

HighCVSS 7.5/10Last modified Jul 15, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-436 CWE-179

Affected software

No affected versions have been published.

Timeline

Published: Feb 3, 2026
Last modified: Jul 15, 2026
NVD status: Modified

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