VDB
CVE-2026-15565
CVE-2026-15565
PUBLISHED
CVSS 7.5 HIGH
Reported by redhat · Published August 11, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4.25 | |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.16.0-22.redhat_00057.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.3.14-11.SP11_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:1.5.26-2.Final_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.18.8-1.redhat_00003.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.18.8-1.redhat_00003.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.18.8-1.redhat_00003.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.18.8-1.redhat_00003.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.18.8-1.redhat_00003.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.18.8-1.redhat_00003.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:5.0.31-3.SP2_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:1.10.0-46.Final_redhat_00044.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:4.1.135-1.Final_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:4.1.135-1.Final_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.5.5-30.SP12_redhat_00020.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.5.5-24.SP12_redhat_00016.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:2.2.40-2.SP3_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | 0:7.4.25-2.GA_redhat_00001.1.el7eap |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1.8.GA | 2.3.26.SP3-redhat-00001 |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.40.0-8.redhat_00024.1.el10eap |
…and 314 more
Timeline
- Aug 11, 2026 EPSS Score
- Aug 11, 2026 Coalition ESS Score
- Aug 11, 2026 CVE Published
- Aug 16, 2026 Security Advisory
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
References
- RHSA-2026:53644 vendor-advisoryx_refsource_REDHAT
- RHSA-2026:53806 vendor-advisoryx_refsource_REDHAT
- RHSA-2026:70228 vendor-advisoryx_refsource_REDHAT
- RHSA-2026:70229 vendor-advisoryx_refsource_REDHAT
- RHSA-2026:70230 vendor-advisoryx_refsource_REDHAT
- RHSA-2026:70277 vendor-advisoryx_refsource_REDHAT
- vdb-entryx_refsource_REDHAT
- RHBZ#2490628 issue-trackingx_refsource_REDHAT
- RHSA-2026:53645 vendor-advisory
- RHSA-2026:53646 vendor-advisory