CVE-2026-87742

Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering

Published Sep 17, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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).

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

No advisories available
History
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
Type Values Removed Values Added
CPEs cpe:/a:redhat:quarkus:3
Vendors & Products Redhat quarkus
References
Type Values Removed Values Added
First Time appeared Redhat build Of Quarkus
Vendors & Products Redhat build Of Quarkus
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Oct 9, 2026, 3:37 PM
Reserved
Sep 9, 2026, 5:58 AM
Status
Awaiting Analysis
Published
Sep 17, 2026, 3:16 PM
Modified
Oct 9, 2026, 4:17 PM
Severity
Important
Public date
Sep 17, 2026, 1:10 PM