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Fastify CVE-2025-66415

| EUVDEUVD-2025-200117 MEDIUM
Unintended Proxy or Intermediary ('Confused Deputy') (CWE-441)
2025-12-01 security-advisories@github.com GHSA-2q7r-29rg-6m5h
5.4
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Red Hat
6.5 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
EUVD ID Assigned
Mar 15, 2026 - 13:34 euvd
EUVD-2025-200117
Analysis Generated
Mar 15, 2026 - 13:34 vuln.today
Patch released
Mar 15, 2026 - 13:34 nvd
Patch available
CVE Published
Dec 01, 2025 - 23:15 nvd
MEDIUM 5.4

DescriptionGitHub Advisory

fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. Prior to 12.5.0, by crafting a malicious URL, an attacker could access routes that are not allowed, even though the reply.from is defined for specific routes in @fastify/reply-from. This vulnerability is fixed in 12.5.0.

AnalysisAI

A security vulnerability in to forward the current HTTP request to another server. (CVSS 5.4). Remediation should follow standard vulnerability management procedures. Vendor patch is available.

Technical ContextAI

Vulnerability type not specified by vendor. Affects to forward the current HTTP request to another server..

RemediationAI

Apply the vendor-supplied patch immediately.

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CVE-2026-2880 HIGH
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Authentication and authorization bypass in @fastify/middie (Node.js middleware library for Fastify) allows remote unauth

Vendor StatusVendor

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CVE-2025-66415 vulnerability details – vuln.today

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