CVE-2025-66415: fastify-reply-from affected by bypass of reply forwarding

December 2, 2025

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.

References

github.com/advisories/GHSA-2q7r-29rg-6m5h
github.com/fastify/fastify-reply-from
github.com/fastify/fastify-reply-from/commit/4d9795cd5b57a36756d37b7f036eae369f69fa66
github.com/fastify/fastify-reply-from/security/advisories/GHSA-2q7r-29rg-6m5h
nvd.nist.gov/vuln/detail/CVE-2025-66415

Code Behaviors & Features

Detect and mitigate CVE-2025-66415 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →