Allocation of Resources Without Limits or Throttling in Quarkus - CVE-2026-87742
Published: October 5, 2026
Vulnerability identifier: #VU153250
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-87742
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by exhausting heap memory and crashing the JVM.
The vulnerability exists due to allocation of resources without limits or throttling in the quarkus-websockets-next WebSocket endpoint's inbound MPSC queue when processing inbound WebSocket messages. A remote attacker can stream messages over a single connection faster than the application's handler can process them to cause a denial of service by exhausting heap memory and crashing the JVM.
Affected software
Quarkus
How to mitigate CVE-2026-87742
Install security update from vendor's website.
Quarkus - addressed in versions 3.27.5.3, 3.33.3.3, 3.39.5