CVE-2026-76166Medium· 4.3▾ SunlitA 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:" …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 23.7 · likelihood 0.5 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
2.7%
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.
mod_cluster-corejws7-mod_cluster (all versions)jws7-tomcat (all versions)jws7-tomcat-native (all versions)jws7-mod_cluster (all versions)jws7-tomcat (all versions)jws7-tomcat-native (all versions)jws7-mod_cluster (all versions)jws7-tomcat (all versions)jws7-tomcat-native (all versions)mod_cluster-core (all versions)mod_cluster-core (all versions)mod_cluster-core (all versions)mod_cluster-coremod_cluster-core (all versions)mod_cluster-core (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Disable multicast-based proxy advertisement and use static proxy configuration instead. When advertisement must be enabled, ensure the multicast network segment (default 224.0.1.105:23364) is properly isolated and not accessible from untrusted network segments.
Connected by shared product, vendor, weakness, or advisory.
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