{"id":"CVE-2026-77711","title":"When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\n\n\n\nThe client mistakenly interprets the 407 as coming from the proxy, so it re-sends the reque…","summary":"When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\n\n\n\nThe client mistakenly interprets the 407 as coming from the proxy, so it re-sends the reque…","severity":"high","cvss":8.2,"cvssVector":"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","cwe":["CWE-200"],"vendor":"Eclipse Foundation","product":"org.eclipse.jetty:jetty-client","affected":["org.eclipse.jetty:jetty-client >= 12.1.0 <= 12.1.12","org.eclipse.jetty:jetty-client >= 12.0.0 <= 12.0.38","org.eclipse.jetty:jetty-client >= 11.0.0 <= 11.0.32","org.eclipse.jetty:jetty-client >= 10.0.0 <= 10.0.32","org.eclipse.jetty:jetty-client >= 9.4.0 <= 9.4.64"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T09:17:18.573","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77711","references":[{"url":"https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw","label":"emo@eclipse.org"},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238","label":"emo@eclipse.org"}],"tags":["nvd","cve.org"],"cvssSource":"cna","ingestedAt":"2026-10-15T08:58:33.093Z","slug":"CVE-2026-77711","body":"## Overview\n\nWhen Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\n\n\n\nThe 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}