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Medium · 6.9 CVE-2025-66415 EUVD-2025-200117GHSA-2q7r-29rg-6m5h

fastify-reply-from bypass of reply forwarding

Published Dec 1, 2025 · Updated Dec 2, 2025 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
fastify fastify-reply-from < 12.5.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @fastify/reply-from < 12.5.0 12.5.0 GHSA-2q7r-29rg-6m5h

References