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 ()
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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 0.32%, higher than 23% of scored CVEs.
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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)
- 0.32% (percentile 23)
- Assigned by
- eclipse
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
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
- 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.