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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-87742
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 15:16:56 UTC
Updated2026-09-22 16:18:06 UTC
DescriptionA 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).

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004170000 probability, percentile 0.357370000 (date 2026-09-22)

Problem Types: CWE-770 | CWE-770 Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Exploit Intelligence Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:69470 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-87742 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:69440 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Michael Read ((https://github.com/Michael-JRead)) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-09T05:57:34.505ZReported to Red Hat.
CNA2026-09-17T13:10:22.000ZMade public.

Workarounds

CNA: 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.

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