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CVE-2026-77711 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw	CISA-ADP
https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw	[email protected]
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 15, 2026	CVE Modified	CISA-ADP
Oct 15, 2026	New CVE Received	[email protected]