CVE-2026-15565
CVE-2026-15565 · Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method
This page contains facts from public vulnerability sources. Check the original advisory before updating.
This page shows selected source facts. See the linked advisories for the complete description and affected versions.
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 · EPSS 1.2%
- Published
- Updated
Stack: system
Affected products and versions
red hat jboss enterprise application platform 7.4.25
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:2.16.0-22.redhat_00057.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:2.3.14-11.SP11_redhat_00001.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:1.5.26-2.Final_redhat_00001.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:2.18.8-1.redhat_00003.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:5.0.31-3.SP2_redhat_00001.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:1.10.0-46.Final_redhat_00044.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:4.1.135-1.Final_redhat_00001.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:2.5.5-30.SP12_redhat_00020.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:2.5.5-24.SP12_redhat_00016.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:2.2.40-2.SP3_redhat_00001.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 7
- Versions
- ≥ 0:7.4.25-2.GA_redhat_00001.1.el7eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:2.16.0-22.redhat_00057.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:2.3.14-11.SP11_redhat_00001.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:1.5.26-2.Final_redhat_00001.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:2.18.8-1.redhat_00003.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:5.0.31-3.SP2_redhat_00001.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:1.10.0-46.Final_redhat_00044.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:4.1.135-1.Final_redhat_00001.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:2.5.5-30.SP12_redhat_00020.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:2.5.5-24.SP12_redhat_00016.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:2.2.40-1.SP3_redhat_00001.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 8
- Versions
- ≥ 0:7.4.25-2.GA_redhat_00001.1.el8eap: Not affected (rpm)
No fix published
red hat jboss enterprise application platform 7.4 els on rhel 9
- Versions
- ≥ 0:2.16.0-22.redhat_00057.1.el9eap: Not affected (rpm)
No fix published
Original sources
- https://access.redhat.com/errata/RHSA-2026:53644
- https://access.redhat.com/errata/RHSA-2026:53645
- https://access.redhat.com/errata/RHSA-2026:53646
- https://access.redhat.com/errata/RHSA-2026:53806
- https://access.redhat.com/errata/RHSA-2026:70228
- https://access.redhat.com/errata/RHSA-2026:70229
- https://access.redhat.com/errata/RHSA-2026:70230
- https://access.redhat.com/errata/RHSA-2026:70277
- https://access.redhat.com/security/cve/CVE-2026-15565
- https://bugzilla.redhat.com/show_bug.cgi?id=2490628
- https://nvd.nist.gov/vuln/detail/CVE-2026-15565