High 8.2Published Oct 15, 2026

CVE-2026-77711When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).

Updated under an hour ago (Oct 28, 2026, 8:10 AM ET)

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It affects Eclipse Foundation Eclipse Jetty. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.44%, higher than 38% of scored CVEs.

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Every CVE for Eclipse Foundation Eclipse Jetty

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.44% (percentile 38)
Assigned by: eclipse
NVD analysis: Awaiting Analysis
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Eclipse Foundation Eclipse Jetty eclipse_foundation:eclipse_jetty (from the name)	from 12.1.0 through 12.1.12; from 12.0.0 through 12.0.38; from 11.0.0 through 11.0.32; from 10.0.0 through 10.0.32; from 9.4.0 through 9.4.64	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.