jws7-mod_cluster: A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module)
CVE-2026-76166 is fixed in 3 products on 1 platform, first by RHSA-2026:93618, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jws7-mod_cluster · RHEL 10 | 2.1.1-1.Final_redhat_00001.1.el10jws | RHSA-2026:93618 | Sep 23, 2026 |
| jws7-tomcat · RHEL 10 | 11.0.21-10.redhat_00010.1.el10jws | RHSA-2026:93618 | Sep 23, 2026 |
| jws7-tomcat-native · RHEL 10 | 1.3.7-4.redhat_4.el10jws | RHSA-2026:93618 | Sep 23, 2026 |
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