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2 vulnerabilities found for Red Hat JBoss Web Server 7.0.3 by Red Hat

CVE-2026-76166 (GCVE-0-2026-76166)

Vulnerability from nvd – Published: 2026-08-19 10:01 – Updated: 2026-11-03 17:46

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)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1088 records in the last 180 days details

References

4 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/security/cve/CVE-2026-76166	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2510883	issue-trackingx_refsource_REDHAT

Impacted products

16 products

Vendor	Product	Version
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 JBoss Web Server 6	cpe:/a:redhat:jboss_enterprise_web_server:6
Red Hat	Red Hat Single Sign-On 7	cpe:/a:redhat:red_hat_single_sign_on:7

Date Public

2026-08-04 00:00

Credits

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.

Show details on NVD website

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