CVE-2026-15565Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method
Updated under an hour ago ()
Does this affect you?
It affects Red Hat JBoss Enterprise Application Platform 7.4.25 and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-120
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat JBoss Enterprise Application Platform 7.4.25 redhat:jboss_enterprise_application_platform | from 2.2.40.SP3-redhat-00001 not affected | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els | from 0:2.16.0-22.redhat_00057.1.el7eap not affected | CNA record |
Red Hat Red Hat build of Apache Camel for Spring Boot 4 redhat:camel_spring_boot | 4 | CNA record |
Red Hat Red Hat Data Grid 8 redhat:jboss_data_grid | 8 | CNA record |
Red Hat Red Hat Fuse 7 redhat:jboss_fuse | 7 | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack redhat:jbosseapxp | Versions not stated | CNA record |
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on | 7 | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:53644vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:53645vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:53646vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:53806vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:70228vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:70229vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:70230vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:70277vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-15565vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2490628issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.