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Fencer Vulns
high 8.8

CVE-2026-18660 json

Jetty proxy blacklist performs case-sensitive matching of case-insensitive DNS hostnames

published 2026-10-15 25 d ago modified 2026-10-15 25 d ago also EUVD-2026-101987

cvss
8.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

In Eclipse Jetty, across various versions of `jetty-server`, and `jetty-proxy`, the host whitelist/blacklist is case-sensitive, and would allow hosts through that only differ by case.

Patch / fix

  • eclipse jetty 12.0.39, 12.1.12
  • org.eclipse.jetty jetty-server 12.0.39, 12.1.12
  • org.eclipse.jetty jetty-proxy 9.4.65, 10.0.33, 11.0.33
  • jetty12 Debian 14 12.0.39-1

debian advisories DEBIAN-CVE-2026-18660

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18660 updated cvss 8.2

org.eclipse.jetty/jetty-server: org.eclipse.jetty/jetty-proxy: Eclipse Jetty: Access control bypass via case-sensitive host filtering

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9 Red Hat OpenShift Developer Tools and Services jenkins 2.516.3.1758206866-3.el9 Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, +4 more Red Hat AMQ Broker 7 jetty-server 12.1.10.redhat-00001 Red Hat build of Apache Camel - HawtIO 4 jetty-server 12.1.10.redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 jetty-proxy 12.1.11.redhat-00001, jetty-server 12.1.10.redhat-00001
    +7 more products
    Red Hat build of Apicurio Registry 3 jetty-proxy 12.1.11.redhat-00001, jetty-server 12.1.10.redhat-00001 Red Hat build of Debezium 3 jetty-server 12.1.10.redhat-00001 Red Hat Enterprise Linux 7 maven-site-plugin-javadoc, maven-site-plugin 3.2-7.el7 Red Hat Enterprise Linux 9 jmc, maven-resolver, jsoup 1.17.2-4.el10, maven-resolver-javadoc Red Hat OpenShift AI (RHOAI) rhoai/odh-spark-operator-rhel9 Red Hat OpenShift Dev Spaces devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9 Red Hat Satellite 6 puppetserver
    affected: workaround, no fix available
  • Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4/jenkins-rhel8 1792044326
    fixed: vendor fix RHSA-2026:88152
  • Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4/jenkins-rhel8 1792044327
    fixed: vendor fix RHSA-2026:88149
  • Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4/jenkins-rhel8 1792044382
    fixed: vendor fix RHSA-2026:88151
  • Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4/jenkins-rhel8 1792044386
    fixed: vendor fix RHSA-2026:88150
  • Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4/jenkins-rhel9 1792040287
    fixed: vendor fix RHSA-2026:88156
  • Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4/jenkins-rhel9 1792040131
    fixed: vendor fix RHSA-2026:88159
  • Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4/jenkins-rhel9 1792041514
    fixed: vendor fix RHSA-2026:88153
show 9 more
  • Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4/jenkins-rhel9 1792040733
    fixed: vendor fix RHSA-2026:88158
  • Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4/jenkins-rhel9 1792040081
    fixed: vendor fix RHSA-2026:88157
  • Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4/jenkins-rhel9 1792040096
    fixed: vendor fix RHSA-2026:88155
  • Red Hat OpenShift Developer Tools and Services 4.22 ocp-tools-4/jenkins-rhel9 1792040428
    fixed: vendor fix RHSA-2026:88154
  • Red Hat Satellite 6.16 for RHEL 8 openvox-server 8.17.0-1.el8sat Red Hat Satellite 6.16 for RHEL 9 openvox-server 8.17.0-1.el9sat
    fixed: vendor fix RHSA-2026:92858
  • Red Hat Satellite 6.17 for RHEL 9 openvox-server 8.17.0-1.el9sat
    fixed: vendor fix RHSA-2026:92859
  • Red Hat Satellite 6.18 for RHEL 9 openvox-server 8.17.0-1.el9sat
    fixed: vendor fix RHSA-2026:92860
  • Red Hat Satellite 6.19 for RHEL 9 openvox-server 8.17.0-1.el9sat
    fixed: vendor fix RHSA-2026:92861
  • Red Hat OpenShift Developer Tools and Services 4.12 ocp-tools-4/jenkins-agent-base-rhel8 1792044376 Red Hat OpenShift Developer Tools and Services 4.13 ocp-tools-4/jenkins-agent-base-rhel8 1792044361 Red Hat OpenShift Developer Tools and Services 4.14 ocp-tools-4/jenkins-agent-base-rhel8 1792044402 Red Hat OpenShift Developer Tools and Services 4.15 ocp-tools-4/jenkins-agent-base-rhel8 1792044379 Red Hat OpenShift Developer Tools and Services 4.16 ocp-tools-4/jenkins-agent-base-rhel9 1792040156 Red Hat OpenShift Developer Tools and Services 4.17 ocp-tools-4/jenkins-agent-base-rhel9 1792040149
    +5 more products
    Red Hat OpenShift Developer Tools and Services 4.18 ocp-tools-4/jenkins-agent-base-rhel9 1792041201 Red Hat OpenShift Developer Tools and Services 4.19 ocp-tools-4/jenkins-agent-base-rhel9 1792040114 Red Hat OpenShift Developer Tools and Services 4.20 ocp-tools-4/jenkins-agent-base-rhel9 1792040274 Red Hat OpenShift Developer Tools and Services 4.21 ocp-tools-4/jenkins-agent-base-rhel9 1792039948 Red Hat OpenShift Developer Tools and Services 4.22 ocp-tools-4/jenkins-agent-base-rhel9 1792040297
    not affected: vulnerable code not present

11 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/jetty/jetty.project/security/advisories/GHSA-7wfj-j486-mxrf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Classification

Weakness
  • CWE-178 Improper Handling of Case Sensitivity
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.