CVE-2025-66415: reply-from — Fix

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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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-441 CWE-441

Affected Products

Vendor	Product	Versions
fastify	reply-from	< 12.4.0

References

Advisories & Patches

https://github.com/fastify/fastify-reply-from/commit/4d9795cd5b57a36756d37b7f036eae369f69fa66 https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-2q7r-29rg-6m5h

Frequently Asked Questions

What is CVE-2025-66415? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-66415? +

CVE-2025-66415 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-66415? +

CVE-2025-66415 affects products from fastify, specifically: reply-from. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66415? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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