8.2

CVE-2026-77711: eclipse foundation eclipse jetty

CVSS: 8.2v4.0HighAwaiting analysis
AliasesDEBIAN-CVE-2026-77711UBUNTU-CVE-2026-77711
Published 15-10-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-77711 is a high (CVSS 8.2) vulnerability in eclipse foundation eclipse jetty. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23.3% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.32%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-10-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

15-10-202618-10-2026
EPSS score
0.32%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • jetty12All versions (No fix recorded)
  • jetty9All versions (No fix recorded)
Eclipse foundation1 product
  • eclipse jetty≥ 12.1.0, ≤ 12.1.12 | ≥ 12.0.0, ≤ 12.0.38 | ≥ 11.0.0, ≤ 11.0.32 | ≥ 10.0.0, ≤ 10.0.32 | ≥ 9.4.0, ≤ 9.4.64
Ubuntu1 product
  • jettyAll versions (No fix recorded)

3 vendors · 4 products

References

5 links