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CVE-2026-25223

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/3/2026

Last Modified2/10/2026

Sourcenvd

Honeypot Sightings0

Affected Products

fastify:fastify

Weaknesses (CWE)

CWE-436

References

https://fastify.dev/docs/latest/Reference/Validation-and-Serialization(security-advisories@github.com)

https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125(security-advisories@github.com)

https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272(security-advisories@github.com)

https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821(security-advisories@github.com)

https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq(security-advisories@github.com)

https://hackerone.com/reports/3464114(security-advisories@github.com)

IOC Correlations

No correlations recorded

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