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4.3 Medium

CVE-2026-76166 A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module)

Description

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.

Affected products and versions

Product Affected versions Fixed in
Red Hat JBoss Enterprise Application Platform 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8 Versions not published
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published
Red Hat JBoss Web Server 5 Versions not published
Red Hat JBoss Web Server 6 Versions not published
Red Hat JBoss Web Server 7 Versions not published
Red Hat Single Sign-On 7 Versions not published
Red Hat JBoss Web Server 7.0.3 Versions not published
Red Hat JBoss Web Server 7.0 on RHEL 10 Versions not published
Show the 2 other branches
Product Affected versions Fixed in
Red Hat JBoss Web Server 7.0 on RHEL 8 Versions not published
Red Hat JBoss Web Server 7.0 on RHEL 9 Versions not published

References

Timeline

  1. Published
  2. Last modified

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