Red Hat Enterprise Application Platform Advertise Listener AdvertiseListenerImpl.java verifyDigest comparison

Summaryinfo

A vulnerability categorized as problematic has been discovered in Red Hat Enterprise Application Platform, Enterprise Application Platform Expansion Pack, Web Server and Single Sign-On. Impacted is the function verifyDigest of the file AdvertiseListenerImpl.java of the component Advertise Listener. Such manipulation leads to comparison. This vulnerability is uniquely identified as CVE-2026-76166. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Application Platform, Enterprise Application Platform Expansion Pack, Web Server and Single Sign-On (affected version unknown). It has been rated as problematic. Affected by this issue is the function verifyDigest of the file AdvertiseListenerImpl.java of the component Advertise Listener. The manipulation with an unknown input leads to a comparison vulnerability. Using CWE to declare the problem leads to CWE-697. The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses. Impacted is availability. CVE summarizes:

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.

The advisory is available at access.redhat.com. This vulnerability is handled as CVE-2026-76166 since 08/19/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/19/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-62367). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Web Server

Vendor

• Red Hat

Name

• Enterprise Application Platform
• Enterprise Application Platform Expansion Pack
• Single Sign-On
• Web Server

License

• open-source

Website

• Vendor: https://www.redhat.com/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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