CVE-2026-77711

Name	CVE-2026-77711
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
jetty12 (PTS)	trixie (security), trixie	12.0.17-3.1~deb13u1	vulnerable
	forky	12.0.33-1	vulnerable
	sid	12.0.40-1	fixed
jetty9 (PTS)	bookworm, bookworm (security)	9.4.57-1.1~deb12u1	vulnerable
	trixie (security), trixie	9.4.57-1.1~deb13u1	vulnerable
	forky, sid	9.4.58-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
jetty12	source	(unstable)	12.0.39-1
jetty9	source	(unstable)	(unfixed)

https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw