Vulnerability Intelligence Report
@fastify-reply-from JSON Content-Type parsing confusion
CVE-2023-51701
fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. A reverse proxy server built with `@fastify/reply-from` could misinterpret the incoming body by passing an header `ContentType: application/json ; charset=utf-8`. This can lead to bypass of security checks. This vulnerability has been patched in '@fastify/reply-from` version 9.6.0.
No Active Exploit Signals
CVSS Base Score
5.3
MEDIUM
Exploitability:3.9
Impact Score:1.5
EPSS Probability:0.48%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-444 ↗CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| fastify | fastify-reply-from | < 9.6.0 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.479%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2023-12-21T21:32:12 |
| Published | 2024-01-08T13:55:05 |
| Last Updated | 2025-06-03T14:37:39 |
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