CVE-2026-77711
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductEclipse Jetty
PublishedOct 15, 2026
First seenOct 15, 2026
Weakness typeCWE-200Sensitive information exposure
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Eclipse Foundation Eclipse Jetty | 12.1.0 ≤ v ≤ 12.1.12, 12.0.0 ≤ v ≤ 12.0.38, 11.0.0 ≤ v ≤ 11.0.32, 10.0.0 ≤ v ≤ 10.0.32, 9.4.0 ≤ v ≤ 9.4.64 | — |
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