CVE-2026-87742
Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering
CVSS Score
7.5
EPSS Score
0.8%
EPSS Percentile
54th
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).
| CWE | CWE-770 |
| Vendor | red hat |
| Product | red hat build of quarkus 3.27.5.sp2 |
| Published | Sep 17, 2026 |
| Last Updated | Oct 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat build of Quarkus 3.27.5.SP2
All versions affected Red Hat / Red Hat build of Quarkus 3.33.3.SP2
All versions affected Red Hat / Exploit Intelligence
All versions affected Red Hat / Red Hat Enterprise Linux AI (RHEL AI) 3
All versions affected Red Hat / Red Hat Enterprise Linux AI (RHEL AI) 3
All versions affected Red Hat / Red Hat Enterprise Linux AI (RHEL AI) 3
All versions affected Red Hat / Red Hat Enterprise Linux AI (RHEL AI) 3
All versions affected References
Credits
Red Hat would like to thank Michael Read ((https://github.com/Michael-JRead)) for reporting this issue.