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.
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Affected Vendors & Products
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History
Wed, 04 Feb 2026 22:15:00 +0000
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ssvc
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Wed, 04 Feb 2026 12:15:00 +0000
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Fastify
Fastify fastify |
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| Weaknesses | CWE-179 | |
| Vendors & Products |
Fastify
Fastify fastify |
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threat_severity
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threat_severity
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Tue, 03 Feb 2026 21:45:00 +0000
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| 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. | |
| Title | Fastify's Content-Type header tab character allows body validation bypass | |
| Weaknesses | CWE-436 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-02-04T21:18:16.693Z
Reserved: 2026-01-30T14:44:47.327Z
Link: CVE-2026-25223
Updated: 2026-02-04T21:18:14.142Z
Status : Awaiting Analysis
Published: 2026-02-03T22:16:31.130
Modified: 2026-02-04T16:33:44.537
Link: CVE-2026-25223