CVE-2026-87742: Red Hat Exploit Intelligence

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A flaw was found in quarkus-websockets-next. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by streaming messages over a single connection faster than the application can process them. Due to unbounded message buffering and a lack of read backpressure, this rapidly exhausts heap space, leading to a java.lang.OutOfMemoryError that crashes the Java Virtual Machine (JVM).

Affected products

• Red Hat Exploit Intelligence
• Red Hat Red Hat Build Of Quarkus 3.27.5.sp2
• Red Hat Red Hat Build Of Quarkus 3.33.3.sp2
• Red Hat Red Hat Enterprise Linux Ai Rhel Ai 3

Published 2026-09-17. Last modified 2026-10-09.