CVE-2026-77711 is a vulnerability in Eclipse Jetty
Published on October 15, 2026
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.
Vulnerability Analysis
CVE-2026-77711 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-77711 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-77711
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Affected Versions
Eclipse Foundation Eclipse Jetty:- Version 12.1.0, <= 12.1.12 is affected.
- Version 12.0.0, <= 12.0.38 is affected.
- Version 11.0.0, <= 11.0.32 is affected.
- Version 10.0.0, <= 10.0.32 is affected.
- Version 9.4.0, <= 9.4.64 is affected.