CVE-2026-88008

Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching...

CVE-2026-71849

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header...

NPM: Hono: Proxy Helper does not remove response headers listed in the `Connection` header

NPM: Hono: Proxy Helper does not remove response headers listed in the Connection header vulnerability discovered by ? in WordPress Npm hono versions = 4.7.0, 4.12.34...

GHSA-79QM-7RJ5-M7R9 Hono: Proxy Helper does not remove response headers listed in the `Connection` header

Summary The Proxy Helper hono/proxy does not remove response headers named by the origin's Connection header. Headers that the origin marked as connection-scoped are therefore forwarded to clients. Details Per RFC 9110 Section 7.6.1, an intermediary must remove the header fields listed in a...

Hono: Proxy Helper does not remove response headers listed in the `Connection` header

Summary The Proxy Helper hono/proxy does not remove response headers named by the origin's Connection header. Headers that the origin marked as connection-scoped are therefore forwarded to clients. Details Per RFC 9110 Section 7.6.1, an intermediary must remove the header fields listed in a...

HTTP Request Smuggling

Overview hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to HTTP Request Smuggling in the proxy process. An attacker can access connection-scoped or internal metadata by sending requests to an application that proxies responses from an origin...

CVE-2026-71849 Hono: Proxy Helper does not remove response headers listed in the `Connection` header

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header...

CVE-2026-71849

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header...

EUVD-2026-54579

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header...

CVE-2026-71849

Hono (Web application framework) vulnerability: from versions 4.7.0–4.12.33, the Proxy Helper proxy() in hono/proxy does not remove response headers named by the origin’s Connection header, potentially exposing headers intended for the origin’s peer. Per RFC 9110, intermediaries must remove Conne...

CVE-2026-71849 Hono: Proxy Helper does not remove response headers listed in the `Connection` header

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header...

CVE-2026-71849 Hono: Proxy Helper does not remove response headers listed in the `Connection` header

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC 9110 Section 7.6.1, an intermediary must remove the header...

GHSA-4MP9-239F-G9HG Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation

Summary An attacker can force WebSocket upgrade via the lax V07 or V08 handshaker by sending Sec-WebSocket-Version: 7 and omitting Connection: Upgrade / Upgrade: websocket headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request...

Traefik 2.11.x < 2.11.38 / 3.x < 3.6.9 Connection Header Bypass

The version of Traefik installed on the remote macOS host is 2.11.x prior to 2.11.38 or 3.x prior to 3.6.9. It is, therefore, affected by a vulnerability: - A flaw exists in HTTP/1.1 request handling due to case-sensitive comparison of Connection header tokens against protected header names. An...

Improper Handling Of The HTTP Connection Header

@fastify/reply-from and @fastify/http-proxy are vulnerable to Improper Handling of the HTTP Connection Header. The vulnerability is due to processing the client-supplied Connection header after proxy-added headers have been inserted, which allows an attacker to selectively remove security, routin...

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

Summary @fastify/reply-from and @fastify/http-proxy 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 like access control or identification headers from upstream requests by...

EUVD-2026-22877

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

GHSA-GWHP-PF74-VJ37 Fastify's connection header abuse enables stripping of proxy-added headers

Summary @fastify/reply-from and @fastify/http-proxy 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 like access control or identification headers from upstream requests by...

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 i...

HTTP Header Injection

Overview @fastify/http-proxy is a proxy http requests, for Fastify Affected versions of this package are vulnerable to HTTP Header Injection via improper handling of the Connection header after proxy-added headers have been set. An attacker can remove headers intended for routing, access control,...