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CVE-2026-77711GHSA-r2c5-3p8g-wpvw

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 fro

Eclipse Foundation Eclipse JettyWeb servers
Open in ThreatlineRecord JSON
CVSS
8.2High
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 15 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.32%Chance of exploitation activity in the next 30 days, higher than 23% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published15 Oct 2026Updated 15 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 5

  • Eclipse Jettyaffected: 12.1.0 through 12.1.12CVE List
  • Eclipse Jettyaffected: 12.0.0 through 12.0.38CVE List
  • Eclipse Jettyaffected: 11.0.0 through 11.0.32CVE List
  • Eclipse Jettyaffected: 10.0.0 through 10.0.32CVE List
  • Eclipse Jettyaffected: 9.4.0 through 9.4.64CVE List

References 2