Is @fastify/reply-from affected by CVE-2026-33805?

npm @fastify/reply-from is affected in <12.6.2.

Is CVE-2026-33805 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

critical

CVE-2026-33805

Q: Is CVE-2026-33805 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

npm · @fastify/reply-from • npm · @fastify/http-proxy

Summary

Fastify's connection header abuse enables stripping of proxy-added headers

Severity: critical
EPSS: 0.3% (p25)
Also known as: GHSA-gwhp-pf74-vj37#@fastify/http-proxy, GHSA-gwhp-pf74-vj37#@fastify/reply-from
Published: 2026-04-16

References

https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37
https://nvd.nist.gov/vuln/detail/CVE-2026-33805
https://cna.openjsf.org/security-advisories.html

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.