Vulnerability · Published Oct 15, 2026 · Assigned by eclipse
CVE-2026-18660Jetty proxy blacklist performs case-sensitive matching of case-insensitive DNS hostnames
High 8.8
In plain English
A high-severity server-side request forgery in org.eclipse.jetty:jetty-proxy from Eclipse Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)8.8High
Exploit odds (30 days)0.3%top 75.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | jetty12 | no fix listed | DEBIAN-CVE-2026-18660 |
| Debian:14 | jetty12 | 12.0.39-1 | DEBIAN-CVE-2026-18660 |
| Debian:12 | jetty9 | no fix listed | DEBIAN-CVE-2026-18660 |
| Debian:13 | jetty9 | no fix listed | DEBIAN-CVE-2026-18660 |
| Debian:14 | jetty9 | no fix listed | DEBIAN-CVE-2026-18660 |
| Ubuntu:26.04:LTS | jetty12 | no fix listed | UBUNTU-CVE-2026-18660 |
| Ubuntu:26.10 | jetty12 | no fix listed | UBUNTU-CVE-2026-18660 |
| Ubuntu:22.04:LTS | jetty9 | no fix listed | UBUNTU-CVE-2026-18660 |
| Ubuntu:24.04:LTS | jetty9 | no fix listed | UBUNTU-CVE-2026-18660 |
| Ubuntu:26.04:LTS | jetty9 | no fix listed | UBUNTU-CVE-2026-18660 |
| Ubuntu:26.10 | jetty9 | no fix listed | UBUNTU-CVE-2026-18660 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Eclipse Foundation | org.eclipse.jetty:jetty-server | 12.1.0 – through 12.1.1112.0.0 – through 12.0.38 |
| Eclipse Foundation | org.eclipse.jetty:jetty-proxy | 11.0.0 – through 11.0.3210.0.0 – through 10.0.329.0.0 – through 9.4.64 |
Weakness: CWE-178, CWE-918 · Vector: 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