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).
History

Fri, 09 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat quarkus
CPEs cpe:/a:redhat:quarkus:3.27::el8
cpe:/a:redhat:quarkus:3.33::el8
Vendors & Products Redhat quarkus

Tue, 22 Sep 2026 15:00:00 +0000

Type Values Removed Values Added
References

Mon, 21 Sep 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:quarkus:3
Vendors & Products Redhat quarkus
References

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat build Of Quarkus
Vendors & Products Redhat build Of Quarkus

Fri, 18 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 17 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 17 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
Description 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).
Title Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering
First Time appeared Redhat
Redhat enterprise Linux Ai
Redhat exploit Intelligence
Redhat quarkus
Weaknesses CWE-770
CPEs cpe:/a:redhat:enterprise_linux_ai:3
cpe:/a:redhat:exploit_intelligence:0
cpe:/a:redhat:quarkus:3
Vendors & Products Redhat
Redhat enterprise Linux Ai
Redhat exploit Intelligence
Redhat quarkus
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-09-17T14:57:44.414Z

Updated: 2026-10-09T15:37:02.180Z

Reserved: 2026-09-09T05:58:00.263Z

Link: CVE-2026-87742

cve-icon Vulnrichment

Updated: 2026-09-17T15:19:14.295Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-17T15:16:56.137

Modified: 2026-10-09T16:17:31.303

Link: CVE-2026-87742

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-17T13:10:22Z

Links: CVE-2026-87742 - Bugzilla