---
id: CVE-2026-18660
title: >-
  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.
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.
severity: high
cvss: 8.8
cvssVector: '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'
cwe:
  - CWE-178
  - CWE-918
vendor: Eclipse Foundation
product: 'org.eclipse.jetty:jetty-server'
affected:
  - 'org.eclipse.jetty:jetty-server >= 12.1.0 <= 12.1.11'
  - 'org.eclipse.jetty:jetty-server >= 12.0.0 <= 12.0.38'
  - 'org.eclipse.jetty:jetty-proxy >= 11.0.0 <= 11.0.32'
  - 'org.eclipse.jetty:jetty-proxy >= 10.0.0 <= 10.0.32'
  - 'org.eclipse.jetty:jetty-proxy >= 9.0.0 <= 9.4.64'
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T10:17:12.097'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18660'
references:
  - url: >-
      https://github.com/jetty/jetty.project/security/advisories/GHSA-7wfj-j486-mxrf
    label: emo@eclipse.org
  - url: 'https://gitlab.eclipse.org/security/cve-assignment/-/work_items/212'
    label: emo@eclipse.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-15T09:59:33.284Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.