CVE-2026-77711CWE-200information-disclosure

CVE-2026-77711

published October 15, 2026

CVSS
8.2
EPSS
0%
Percentile
23.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.2 · NONE
CVSS v4.0
8.2 · 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
EPSS
0.00320 · 23.7th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-10-15T13:17Z
References (3)
https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw · [email protected]https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238 · [email protected]https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 16 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 15 OCT 08:51Z
    When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required)
    cvelistv5
  • 15 OCT 08:51Z
    When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required)
    cvelistv5