CVE-2026-93564 Denial of service in Red Hat AMQ Broker 7
Remote attackers can cause memory exhaustion and denial of service by sending crafted HAProxy PROXY-v2 headers to applications using the Netty codec.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93564?
CVE-2026-93564 is a high-severity denial of service 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. A reference-count leak in the HAProxy PROXY-v2 message decoder allows a remote, unauthenticated attacker to send specially crafted PROXY-protocol v2 headers. This can lead to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.
Weakness: CWE-1035
Which versions are affected by CVE-2026-93564?
How do I fix CVE-2026-93564?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-93564 being exploited?
There is no known exploitation of CVE-2026-93564 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93564, GHSA-74qm-9qc5-ff4g, UBUNTU-CVE-2026-93564.