CVE-2026-93567 Security feature bypass in Red Hat AMQ Broker 7
Attackers can bypass tunnel allow-lists and egress policies by manipulating Host headers in HTTP/1 CONNECT requests translated to HTTP/2.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93567?
CVE-2026-93567 is a high-severity vulnerability in Red Hat AMQ Broker 7, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.
Weakness: CWE-20
Which versions are affected by CVE-2026-93567?
How do I fix CVE-2026-93567?
Upgrade to a fixed version.
Is CVE-2026-93567 being exploited?
There is no known exploitation of CVE-2026-93567 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-IT87450, DEBIAN-CVE-2026-93567, GHSA-xf8w-rc87-x5gw, UBUNTU-CVE-2026-93567.