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CVE-2026-15565

A flaw was found in Undertow.

Impact

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.

Affected products

VendorProductAffected versions
Red HatRed Hat JBoss Enterprise Application Platform 8.1 For RHEL 8
Versions patch: 0:8.1.8-9.GA_redhat_00006.1.el8eap, patch: 0:6.6.54-1.Final_redhat_00001.1.el8eap, patch: 0:2.0.5-1.Final_redhat_00001.1.el8eap, patch: 0:2.6.11-1.Final_redhat_00001.1.el8eap, patch: 0:1.1.9-1.redhat_00001.1.el8eap, patch: 0:2.0.18-1.redhat_00001.1.el8eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 For RHEL 9
Versions patch: 0:5.0.31-1.SP2_redhat_00001.1.el9eap, patch: 0:8.1.8-9.GA_redhat_00006.1.el9eap, patch: 0:2.6.11-1.Final_redhat_00001.1.el9eap, patch: 0:2.25.4-1.redhat_00003.1.el9eap, patch: 0:4.1.7-1.SP1_redhat_00001.1.el9eap, patch: 0:4.1.136-1.Final_redhat_00001.1.el9eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 For RHEL 10
Versions patch: 0:8.1.1-12.GA_redhat_00048.1.el10eap, patch: 0:2.40.0-8.redhat_00024.1.el10eap, patch: 0:2.3.26-2.SP3_redhat_00001.1.el10eap, patch: 0:1.2.7-1.redhat_00002.1.el10eap, patch: 0:5.0.31-1.SP2_redhat_00001.1.el10eap, patch: 0:1.1.9-1.redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1.8.GA
Version patch: 2.3.26.SP3-redhat-00001
Red HatRed Hat JBoss Enterprise Application Platform 7.4 ELS On RHEL 7
Versions patch: 0:1.5.26-2.Final_redhat_00001.1.el7eap, patch: 0:2.3.14-11.SP11_redhat_00001.1.el7eap, patch: 0:2.5.5-24.SP12_redhat_00016.1.el7eap, patch: 0:5.0.31-3.SP2_redhat_00001.1.el7eap, patch: 0:2.2.40-2.SP3_redhat_00001.1.el7eap, patch: 0:7.4.25-2.GA_redhat_00001.1.el7eap

Weakness classification

CWE-120

References