CVE-2026-76166

CVE CVE-2026-76166EUVD EUVD-2026-62367Published 2026-08-19T10:01:28.000ZLast changed 2026-08-20T15:23:41.000ZCVSS 4.3

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Red Hat — Red Hat JBoss Enterprise Application Platform 7
• Red Hat — Red Hat JBoss Enterprise Application Platform 8
• Red Hat — Red Hat JBoss Enterprise Application Platform Expansion Pack
• Red Hat — Red Hat JBoss Web Server 5
• Red Hat — Red Hat JBoss Web Server 6
• Red Hat — Red Hat JBoss Web Server 7
• Red Hat — Red Hat Single Sign-On 7

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Red Hat — Red Hat JBoss Enterprise Application Platform

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.