CVE-2026-76166 (GCVE-0-2026-76166)
Vulnerability from cvelistv5 – Published: 2026-08-19 10:01 – Updated: 2026-11-09 23:15
VLAI
EPSS
VEX
Title
Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram
Summary
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.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 14:19 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:93618 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:93622 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:96228 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:96229 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-76166 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2510883 | issue-trackingx_refsource_REDHAT |
Impacted products
25 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat JBoss Web Server 6.2.6 |
cpe:/a:redhat:jboss_enterprise_web_server:6.2
|
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 10 |
Unaffected:
0:2.0.5-1.Final_redhat_00001.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 10 |
Unaffected:
0:10.1.49-18.redhat_00018.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 10 |
Unaffected:
0:1.3.6-2.redhat_2.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 8 |
Unaffected:
0:2.0.5-1.Final_redhat_00001.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 8 |
Unaffected:
0:10.1.49-18.redhat_00018.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 8 |
Unaffected:
0:1.3.6-2.redhat_2.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 9 |
Unaffected:
0:2.0.5-1.Final_redhat_00001.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 9 |
Unaffected:
0:10.1.49-18.redhat_00018.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 6.2 on RHEL 9 |
Unaffected:
0:1.3.6-2.redhat_2.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8 cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0.3 |
cpe:/a:redhat:jboss_enterprise_web_server:7.0
|
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 10 |
Unaffected:
0:2.1.1-1.Final_redhat_00001.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 10 |
Unaffected:
0:11.0.21-10.redhat_00010.1.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 10 |
Unaffected:
0:1.3.7-4.redhat_4.el10jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 8 |
Unaffected:
0:2.1.1-1.Final_redhat_00001.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 8 |
Unaffected:
0:11.0.21-10.redhat_00010.1.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 8 |
Unaffected:
0:1.3.7-4.redhat_4.el8jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 9 |
Unaffected:
0:2.1.1-1.Final_redhat_00001.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 9 |
Unaffected:
0:11.0.21-10.redhat_00010.1.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| Red Hat | Red Hat JBoss Web Server 7.0 on RHEL 9 |
Unaffected:
0:1.3.7-4.redhat_4.el9jws , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8 cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9 |
||
| 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 Single Sign-On 7 |
cpe:/a:redhat:red_hat_single_sign_on:7
|
Date Public
2026-08-04 00:00
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-76166",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-20T14:19:26.119248Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-20T15:23:41.023Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2"
],
"defaultStatus": "unaffected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 6.2.6",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-mod_cluster",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.0.5-1.Final_redhat_00001.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:10.1.49-18.redhat_00018.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat-native",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.6-2.redhat_2.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-mod_cluster",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.0.5-1.Final_redhat_00001.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:10.1.49-18.redhat_00018.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat-native",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.6-2.redhat_2.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-mod_cluster",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.0.5-1.Final_redhat_00001.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:10.1.49-18.redhat_00018.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat-native",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.6-2.redhat_2.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0"
],
"defaultStatus": "unaffected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 7.0.3",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jbosseapxp"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:5"
],
"defaultStatus": "unknown",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 5",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
}
],
"credits": [
{
"lang": "en",
"value": "Red Hat would like to thank Kien Pham (Ninh Thanh Cyber Security (NTCS)) and Ta Duc Thien (Ninh Thanh Cyber Security (NTCS)) for reporting this issue."
}
],
"datePublic": "2026-08-04T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in mod_cluster\u0027s 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\u0027s 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."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Moderate"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-09T23:15:27.629Z",
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat"
},
"references": [
{
"name": "RHSA-2026:93618",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:93618"
},
{
"name": "RHSA-2026:93622",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:93622"
},
{
"name": "RHSA-2026:96228",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:96228"
},
{
"name": "RHSA-2026:96229",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:96229"
},
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-76166"
},
{
"name": "RHBZ#2510883",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510883"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-07-23T00:00:00.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-08-04T00:00:00.000Z",
"value": "Made public."
}
],
"title": "Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram",
"workarounds": [
{
"lang": "en",
"value": "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."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-476: NULL Pointer Dereference"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-76166",
"datePublished": "2026-08-19T10:01:28.199Z",
"dateReserved": "2026-08-19T09:18:28.627Z",
"dateUpdated": "2026-11-09T23:15:27.629Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-76166",
"date": "2026-11-10",
"epss": "0.02399",
"percentile": "0.84156"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2"
],
"defaultStatus": "unaffected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 6.2.6",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-mod_cluster",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.0.5-1.Final_redhat_00001.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:10.1.49-18.redhat_00018.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat-native",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.6-2.redhat_2.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-mod_cluster",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.0.5-1.Final_redhat_00001.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:10.1.49-18.redhat_00018.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat-native",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.6-2.redhat_2.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-mod_cluster",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.0.5-1.Final_redhat_00001.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:10.1.49-18.redhat_00018.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:6.2::el9"
],
"defaultStatus": "affected",
"packageName": "jws6-tomcat-native",
"product": "Red Hat JBoss Web Server 6.2 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.6-2.redhat_2.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0"
],
"defaultStatus": "unaffected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 7.0.3",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jbosseapxp"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:5"
],
"defaultStatus": "unknown",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 5",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
}
],
"source": "secalert@redhat.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in mod_cluster\u0027s 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\u0027s 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."
},
{
"lang": "es",
"value": "Se encontr\u00f3 una vulnerabilidad en el AdvertiseListenerImpl de mod_cluster (m\u00f3dulo central org.jboss.modcluster). Un \u00fanico datagrama multicast UDP manipulado con una l\u00ednea de estado HTTP v\u00e1lida y una cabecera \u2019Server:\u2019 pero sin las cabeceras \u2019Date:\u2019, \u2019Digest:\u2019 y \u2019Sequence:\u2019 desencadena una NullPointerException en verifyDigest() que no es capturada por el gestor de excepciones del hilo de trabajo. Esto provoca que el hilo del oyente de anuncios termine permanentemente. El fallo es silencioso (isListening() contin\u00faa devolviendo true) y persiste hasta que se reinicia el nodo. El bloqueo ocurre antes de la comparaci\u00f3n de AdvertiseSecurityKey, por lo que las implementaciones con una clave de seguridad configurada siguen estando afectadas."
}
],
"id": "CVE-2026-76166",
"lastModified": "2026-11-10T00:17:15.903",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 1.4,
"source": "secalert@redhat.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-76166",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-20T14:19:26.119248Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-19T10:16:38.150",
"references": [
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/errata/RHSA-2026:93618"
},
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/errata/RHSA-2026:93622"
},
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/errata/RHSA-2026:96228"
},
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/errata/RHSA-2026:96229"
},
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/security/cve/CVE-2026-76166"
},
{
"source": "secalert@redhat.com",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510883"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "secalert@redhat.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-09T23:15:17+00:00",
"cve": "CVE-2026-76166",
"id": "CVE-2026-76166",
"initial_release_date": "2026-08-04T00:00:00+00:00",
"product_status:fixed": "104",
"product_status:known_affected": "5",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "modcluster-core: mod_cluster Advertise Listener: unauthenticated DoS via crafted multicast datagram",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76166.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-76166",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-20T14:19:26.119248Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-20T14:19:27.344Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0"
],
"defaultStatus": "unaffected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 7.0.3",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el10jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 8",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el8jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-mod_cluster",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.1.1-1.Final_redhat_00001.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:11.0.21-10.redhat_00010.1.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el10",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el8",
"cpe:/a:redhat:jboss_enterprise_web_server:7.0::el9"
],
"defaultStatus": "affected",
"packageName": "jws7-tomcat-native",
"product": "Red Hat JBoss Web Server 7.0 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.7-4.redhat_4.el9jws",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jbosseapxp"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:5"
],
"defaultStatus": "unknown",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 5",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_web_server:6"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat JBoss Web Server 6",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "affected",
"packageName": "mod_cluster-core",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
}
],
"credits": [
{
"lang": "en",
"value": "Red Hat would like to thank Kien Pham (Ninh Thanh Cyber Security (NTCS)) and Ta Duc Thien (Ninh Thanh Cyber Security (NTCS)) for reporting this issue."
}
],
"datePublic": "2026-08-04T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in mod_cluster\u0027s 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\u0027s 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."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Moderate"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-03T17:46:20.673Z",
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat"
},
"references": [
{
"name": "RHSA-2026:93618",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:93618"
},
{
"name": "RHSA-2026:93622",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:93622"
},
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-76166"
},
{
"name": "RHBZ#2510883",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510883"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-07-23T00:00:00.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-08-04T00:00:00.000Z",
"value": "Made public."
}
],
"title": "Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram",
"workarounds": [
{
"lang": "en",
"value": "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."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-476: NULL Pointer Dereference"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-76166",
"datePublished": "2026-08-19T10:01:28.199Z",
"dateReserved": "2026-08-19T09:18:28.627Z",
"dateUpdated": "2026-11-03T17:46:20.673Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.