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CVE-2026-77711

HIGH
8.2
CVSS Score
Published: October 15, 2026 at 08:51 AM UTC
Updated: October 15, 2026 at 02:41 PM UTC
1 product affected across 1 vendorJetty

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Severity
HIGH8.2
Exploit prediction
EPSS 0.4%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw
Source: cverecord
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHeclipse
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-200

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