{"id":"UBUNTU-CVE-2026-77711","details":"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.","modified":"2026-10-17T13:01:08.343189160Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-77711"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-77711"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-77711"},{"type":"REPORT","url":"https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw"},{"type":"REPORT","url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238"}],"affected":[{"package":{"name":"jetty","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/jetty?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.26-1ubuntu1","6.1.26-1ubuntu1.1","6.1.26-1ubuntu1.2"],"ecosystem_specific":{"binaries":[{"binary_name":"jetty","binary_version":"6.1.26-1ubuntu1.2"},{"binary_version":"6.1.26-1ubuntu1.2","binary_name":"libjetty-extra"},{"binary_name":"libjetty-extra-java","binary_version":"6.1.26-1ubuntu1.2"},{"binary_version":"6.1.26-1ubuntu1.2","binary_name":"libjetty-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77711.json"}},{"package":{"name":"jetty","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/jetty?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.26-5","6.1.26-5ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libjetty-extra","binary_version":"6.1.26-5ubuntu0.1"},{"binary_name":"libjetty-extra-java","binary_version":"6.1.26-5ubuntu0.1"},{"binary_version":"6.1.26-5ubuntu0.1","binary_name":"libjetty-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77711.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}