CVE-2026-33805

@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from. Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.

The following products are affected by CVE-2026-33805 vulnerability.

No data.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33805.

URL	Resource
https://cna.openjsf.org/security-advisories.html
https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37