Moderate severityNVD Advisory· Published Dec 1, 2025· Updated Dec 2, 2025
fastify-reply-from bypass of reply forwarding
CVE-2025-66415
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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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@fastify/reply-fromnpm | < 12.5.0 | 12.5.0 |
Affected products
2- Range: < 12.5.0
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-2q7r-29rg-6m5hghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-66415ghsaADVISORY
- github.com/fastify/fastify-reply-from/commit/4d9795cd5b57a36756d37b7f036eae369f69fa66ghsax_refsource_MISCWEB
- github.com/fastify/fastify-reply-from/security/advisories/GHSA-2q7r-29rg-6m5hghsax_refsource_CONFIRMWEB
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