CVE-2025-66415
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Fastify Reply-from
PublishedDec 1, 2025
First seenDec 1, 2025
Weakness typeCWE-441CWE-441
How to fix
Update
- @fastify/reply-from12.5.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fastify reply-from | v ≤ 12.4.0 | — |
| @fastify/reply-fromnpm | v < 12.5.0 | 12.5.0 |
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