CVE-2026-86404 Deserialization in Red Hat AMQ Broker 7
Red Hat JBoss EAP permits unsafe deserialization by default in Artemis messaging, allowing attackers to execute arbitrary code via crafted messages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-86404?
CVE-2026-86404 is a high-severity unsafe deserialization vulnerability in Red Hat AMQ Broker 7, published on 7 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
EAP's Artemis deserialization configuration permits deserialization by default. ObjectMessage.getObject() uses ObjectInputStreamWithClassLoader, which implements allow-list/block-list filtering via its checkSecurity()/isTrustedType() method. However, by default both allow-list and block-list are empty. When the allow-list is empty (size == 0), isTrustedType() returns true for ALL classes. This means all classes are deserializable by default.
Weakness: CWE-502
Which versions are affected by CVE-2026-86404?
How do I fix CVE-2026-86404?
Change a configuration setting.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-86404 being exploited?
There is no known exploitation of CVE-2026-86404 in the wild and no public exploit code.
Sources
Also known as GHSA-q97r-w4hq-94gr.