fastify-reply-from affected by bypass of reply forwarding

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0019, the 8th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 2 Dec 2025. New records show when each source confirmed them.

Sources

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

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.