CVE-2026-77711

When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required). The client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials.

• https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238
• https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw