REDHAT-BUG-2436560: High severity fastify Fastify vulnerability

Published Feb 3, 2026
·
Updated

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.

Affected Software

1 affected component
fastify Fastify<5.7.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade fastify to a version that resolves this vulnerability.

    Fixed in 5.7.2

Event History

Feb 3, 2026
Data Sourced
via Red Hat·10:01 PM
DescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of REDHAT-BUG-2436560?

The severity of REDHAT-BUG-2436560 is classified as high, rated at 7.

2

How do I fix REDHAT-BUG-2436560?

To fix REDHAT-BUG-2436560, upgrade Fastify to version 5.7.2 or later.

3

What is the risk assessment for REDHAT-BUG-2436560?

The risk assessment for REDHAT-BUG-2436560 is rated at 33.

4

What does REDHAT-BUG-2436560 involve?

REDHAT-BUG-2436560 involves a validation bypass vulnerability in Fastify that can allow request body validation schemas to be circumvented.

5

Who is affected by REDHAT-BUG-2436560?

Users of Fastify versions prior to 5.7.2 are affected by REDHAT-BUG-2436560.

Contact

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