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CVE-2026-76166— Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram

Quick assessment

Affected
Red Hat Red Hat JBoss Enterprise Application Platform 7
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 mod_cluster 的 AdvertiseListenerImpl（org.jboss.modcluster 核心模块）中发现了一个缺陷。发送一个精心构造的 UDP 多播数据报，其中包含有效的 HTTP 状态行和 “Server:” 头，但缺少 “Date:”、“Digest:” 和 “Sequence:” 头，会触发 verifyDigest() 方法中的 NullPointerException 异常。该异常未被工作线程的异常处理器捕获，导致广告监听线程永久终止。 此故障表现为静默失败（isListen

CVSS 4.3 · Medium EPSS 0.84% · P55
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I. Basic Information for CVE-2026-76166

Vulnerability Information
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Vulnerability Title
Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat JBoss Enterprise Application Platform 7 - cpe:/a:redhat:jboss_enterprise_application_platform:7
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat JBoss Web Server 5 - cpe:/a:redhat:jboss_enterprise_web_server:5
Red Hat Red Hat JBoss Web Server 6 - cpe:/a:redhat:jboss_enterprise_web_server:6
Red Hat Red Hat JBoss Web Server 7 - cpe:/a:redhat:jboss_enterprise_web_server:7
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-76166

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III. Intelligence Information for CVE-2026-76166

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Vendor Advisories for CVE-2026-76166 (2)

Same Patch Batch · Red Hat · 2026-08-19 · 10 CVEs total

CVE-2026-70496 9.9 CRITICAL Search-v2-operator: search-v2-operator: operator clusterrole is cluster-admin equivalent v
CVE-2026-66794 9.3 CRITICAL Cluster-proxy-addon: cluster-proxy-addon: unauthenticated ssrf to arbitrary managed-cluste
CVE-2026-71470 9.1 CRITICAL Acm-search-v2-rhel9: search-v2-operator: search cr imageoverride/arguments/envvar flow uns
CVE-2026-76139 8.0 HIGH Acm-operator-bundle: acm-operator-bundle: bundle build execs unpinned stolostron/release@m
CVE-2026-75569 7.7 HIGH Mce-operator-bundle: mce-operator-bundle: bundle-generation business logic fetched from mu
CVE-2026-76235 7.5 HIGH Cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via cockpitlang cookie
CVE-2026-76827 6.8 MEDIUM Search-indexer: search-indexer: update/delete operations not scoped to caller's cluster (c
CVE-2026-18874 6.2 MEDIUM Volsync-addon-controller: volsync-addon-controller: annotation values rendered into yaml v
CVE-2026-75900 6.1 MEDIUM Swtpm: swtpm: out-of-bounds read in swtpm_nvram_checkheader due to sizeof(pointer) vs size

IV. Related Vulnerabilities

Same product: Red Hat JBoss Enterprise Application Platform 7
Same vendor: Red Hat
Same weakness: CWE-476

V. Comments for CVE-2026-76166

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