CVE-2026-6790 Eclipse Jetty: HTTP Authority/Host mismatch
Attackers can bypass security controls or poison logs by sending mismatched Host headers, affecting Jetty server deployments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6790?
CVE-2026-6790 is a medium-severity vulnerability in Eclipse Jetty, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Eclipse Jetty, for HTTP/1, HTTP/2 and HTTP/3 requests, there is no strict check that the request authority (host and port) matches what provided in the Host header (if present).
This was not enforced in earlier HTTP RFC (for example, in RFC 2616), but it is in the latest RFC (9110 and 9112).
This mismatch can cause a number of problems that may be classified as vulnerabilities such as:
* URI constructions (for example, for redirects -- this is typical for login pages)
* Virtual host selection
* Reverse proxying
* Misleading logs
* Etc.
Given that the latest RFCs require that request authority and Host header must match, Jetty should enforce this invariant.
Weakness: CWE-20
Which versions are affected by CVE-2026-6790?
10 open source packages ship an affected version, including org.eclipse.jetty:jetty-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.eclipse.jetty:jetty-server Maven | From 10.0.0 to 10.0.26 | None |
org.eclipse.jetty:jetty-server Maven | From 10.0.0 to 10.0.26 | None |
org.eclipse.jetty:jetty-server Maven | From 11.0.0 to 11.0.26 | None |
org.eclipse.jetty:jetty-server Maven | From 11.0.0 to 11.0.26 | None |
org.eclipse.jetty:jetty-server Maven | From 12.0.0 | 12.0.35 |
org.eclipse.jetty:jetty-server Maven | From 12.0.0 | 12.0.35 |
4 more packages
org.eclipse.jetty:jetty-server Maven | From 12.1.0 | 12.1.9 |
org.eclipse.jetty:jetty-server Maven | From 12.1.0 | 12.1.9 |
org.eclipse.jetty:jetty-server Maven | From 9.4.0.v20161208 to 9.4.58.v20250814 | None |
org.eclipse.jetty:jetty-server Maven | From 9.4.0.v20161208 to 9.4.58.v20250814 | None |
Products include Eclipse Jetty.
How do I fix CVE-2026-6790?
Upgrade org.eclipse.jetty:jetty-server to a fixed version for your release line: 12.0.35 or 12.1.9.
Is CVE-2026-6790 being exploited?
There is no known exploitation of CVE-2026-6790 in the wild and no public exploit code.
Other vulnerabilities in Eclipse Jetty
- CVE-2016-4800 Jetty contains an alias issue that could allow unauthenticated remote code execution due to specially crafted request
- CVE-2019-17638 Operation on a Resource after Expiration or Release in Jetty Server
- CVE-2018-12538 Access and integrity issue within Eclipse Jetty
- CVE-2026-10050 Digest authentication lossy encoding
- CVE-2025-5115 MadeYouReset HTTP/2 vulnerability
Sources
Also known as CLEANSTART-2026-BB15937, CLEANSTART-2026-BG17653, CLEANSTART-2026-BZ08231, CLEANSTART-2026-FJ86394, CLEANSTART-2026-JF82480, CLEANSTART-2026-JT86822 and 74 more.