CVE-2026-15565
Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.
| CWE | CWE-120 |
| Vendor | red hat |
| Product | red hat jboss enterprise application platform 7.4.25 |
| Published | Aug 11, 2026 |
| Last Updated | Sep 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat JBoss Enterprise Application Platform 7.4.25
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat build of Apache Camel for Spring Boot 4
All versions affected Red Hat / Red Hat Data Grid 8
All versions affected Red Hat / Red Hat Fuse 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:53644 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:53645 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:53646 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:53806 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70228 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70229 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70230 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70277 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-15565 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2490628