CVE-2026-55458

Caddy 's reverse proxy fails to strip RFC 7230 hop-by-hop headers from upstream responses when handling WebSocket upgrades (HTTP 101 Switching Protocols). Specifically, the finalizeResponse method in modules/caddyhttp/reverseproxy/reverseproxy.go returns early for 101 status codes, bypassing the ...

CVE-2026-55458

Caddy's reverse proxy fails to strip RFC 7230 hop-by-hop headers from upstream responses when handling WebSocket upgrades HTTP 101 Switching Protocols. Headers including "Alt-Svc", "Keep-Alive", "Proxy-Authenticate", "Transfer-Encoding", or "Trailer", which Caddy actually correctly strips for...

Caddy has an RFC 7230 §6.1 compliance issue / Hop-by-hop headers that leak through

AI Disclosure This vulnerability was discovered via deepseek-v4-pro1m for finding potential vulnerabilities / inconsistencies in the code base. I made the AI check if Caddy is compliant with various RFCs, incl. 7230. I also used it to help write the PoC, since it was honestly much faster than...

GHSA-8QX7-J2V2-X6Q5 Caddy has an RFC 7230 §6.1 compliance issue / Hop-by-hop headers that leak through

AI Disclosure This vulnerability was discovered via deepseek-v4-pro1m for finding potential vulnerabilities / inconsistencies in the code base. I made the AI check if Caddy is compliant with various RFCs, incl. 7230. I also used it to help write the PoC, since it was honestly much faster than...

PT-2026-130608

Name of the Vulnerable Software and Affected Versions Caddy versions prior to 2.11.5 Description The reverse proxy fails to strip RFC 7230 hop-by-hop headers from upstream responses during WebSocket upgrades HTTP 101 Switching Protocols. While normal responses are filtered, the finalizeResponse...

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...

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...

Cloudflare Public Bug Bounty: HTTP Request Smuggling via Unsanitized Hop-by-Hop Headers

The vulnerability allowed forwarding of HTTP/1 h2c upgrade requests to upstream servers, bypassing request-level filters applied by the proxy. The issue was addressed in Pingora version 0.9.0, which restricted HTTP/1 upgrades to WebSocket by default...

CVE-2026-26365

Akamai Ghost on Akamai CDN edge servers before 2026-02-06 mishandles processing of custom hop-by-hop HTTP headers, where an incoming request containing the header "Connection: Transfer-Encoding" could result in a forward request with invalid message framing, depending on the Akamai processing pat...

Akamai Ghost environmental issues vulnerabilities

Akamai Ghost is an HTTP service program developed by the American company Akamai. Versions of Akamai Ghost prior to 2026-02-06 contained environmental issues. These issues stemmed from improper handling of custom hop-by-hop HTTP headers, which could lead to HTTP requests being interspersed with...

CVE-2026-26365

Akamai Ghost on Akamai CDN edge servers before 2026-02-06 mishandles processing of custom hop-by-hop HTTP headers, where an incoming request containing the header "Connection: Transfer-Encoding" could result in a forward request with invalid message framing, depending on the Akamai processing pat...

CVE-2026-26365

Akamai Ghost on Akamai CDN edge servers before 2026-02-06 mishandles processing of custom hop-by-hop HTTP headers, where an incoming request containing the header "Connection: Transfer-Encoding" could result in a forward request with invalid message framing, depending on the Akamai processing pat...

CVE-2026-26365: Inconsistent Interpretation of HTTP Requests

Akamai Ghost on Akamai CDN edge servers before 2026-02-06 mishandles processing of custom hop-by-hop HTTP headers, where an incoming request containing the header "Connection: Transfer-Encoding" could result in a forward request with invalid message framing, depending on the Akamai processing pat...

EUVD-2022-47981

Malicious code in bioql PyPI...

CVE-2025-48865

Fabio is an HTTPS and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers except X-Forwarded-For due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and...

CVE-2025-48865 Fabio allows HTTP clients to manipulate custom headers it adds

Fabio is an HTTPS and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers except X-Forwarded-For due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and...

CVE-2025-48865: Insufficient Verification of Data Authenticity

Fabio is an HTTPS and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers except X-Forwarded-For due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and...

Fabio security vulnerabilities

Fabio is a Fabio open source application. A security vulnerability exists in Fabio versions prior to 1.6.6 that stems from allowing clients to remove X-Forwarded headers when processing hop-by-hop headers, which could lead to a security hole...