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Vulnerability · Published Oct 15, 2026 · Assigned by eclipse

CVE-2026-77711

High 8.2

In plain English

A high-severity information exposure in Eclipse Jetty from Eclipse Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High
Exploit odds (30 days)0.4%top 61.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13jetty12no fix listedDEBIAN-CVE-2026-77711
Debian:14jetty1212.0.39-1DEBIAN-CVE-2026-77711
Debian:12jetty9no fix listedDEBIAN-CVE-2026-77711
Debian:13jetty9no fix listedDEBIAN-CVE-2026-77711
Debian:14jetty9no fix listedDEBIAN-CVE-2026-77711

Affected products (as reported)

VendorProductVersions
Eclipse Foundation Eclipse Jetty 12.1.0 – through 12.1.1212.0.0 – through 12.0.3811.0.0 – through 11.0.3210.0.0 – through 10.0.329.4.0 – through 9.4.64

Weakness: CWE-200 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References