CVE-2025-66415
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-01

Last updated on: 2026-02-06

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2025-12-01
Last Modified
2026-02-06
Generated
2026-06-16
AI Q&A
2025-12-02
EPSS Evaluated
2026-06-15
NVD
CVE-2025-66415
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
fastify reply-from to 12.4.0 (exc)
fastify reply-from 12.5.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-441 The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.
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Executive Summary

The vulnerability in fastify-reply-from prior to version 12.5.0 allows an attacker to craft a malicious URL to access routes that should be restricted, bypassing the intended route restrictions defined in the plugin. This means unauthorized access to certain server routes could occur.

Impact Analysis

This vulnerability can lead to unauthorized access to server routes that are meant to be restricted, potentially exposing sensitive data or functionality to attackers. It could compromise the security of your application by allowing attackers to reach parts of the system they should not have access to.

Mitigation Strategies

Upgrade the fastify-reply-from plugin to version 12.5.0 or later, as this version contains the fix for the vulnerability.

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