Is CVE-2026-86404 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-86404 being exploited in the wild.

How severe is CVE-2026-86404?

High severity, with a CVSS score of 8.8, published 7 September 2026.

Is there a fix for CVE-2026-86404?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-86404 attacked?

It is attacked over the network.

Am I affected by CVE-2026-86404?

Check whether you run Red Hat Enterprise Application Platform at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-86404: Red Hat Enterprise Application Platform Artemis deserialization vulnerability

CVE-2026-86404 · Severity: high · CVSS 8.8 · Published 2026-09-07

Red Hat Enterprise Application Platform (EAP) contains a messaging service called Artemis that allows untrusted data to be deserialized by default. An attacker with network access to the messaging service could send a malicious message that executes arbitrary code on the server, potentially compromising the entire application and any data it handles.

Technologies: Red Hat Enterprise Application Platform. Vendors: Red Hat.

Quick answers

Is CVE-2026-86404 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-86404 being exploited in the wild.
How severe is CVE-2026-86404?: High severity, with a CVSS score of 8.8, published 7 September 2026.
Which products and versions are affected?: Red Hat Enterprise Application Platform <UNKNOWN>.
Is there a fix for CVE-2026-86404?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-86404 attacked?: It is attacked over the network.
Am I affected by CVE-2026-86404?: Check whether you run Red Hat Enterprise Application Platform at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

Artemis's ObjectMessage.getObject() method uses ObjectInputStreamWithClassLoader for deserialization but leaves both allow-list and block-list empty by default. The isTrustedType() method returns true for all classes when the allow-list is empty, allowing unrestricted deserialization of arbitrary objects. This is a classic unsafe deserialization vulnerability reachable over the network by messaging clients.

Affected products

Red Hat Enterprise Application Platform <UNKNOWN>

Timeline

2026-09-07: disclosed

References

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