---
id: CVE-2026-87742
title: A flaw was found in quarkus-websockets-next
summary: >-
  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 mes…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: Red Hat
product: exploit-intelligence/agent-client-rhel9
affected:
  - exploit-intelligence/agent-client-rhel9 (all versions)
  - rhelai3/bootc-cuda-rhel9 (all versions)
  - rhelai3/bootc-gaudi-rhel9 (all versions)
  - rhelai3/bootc-rocm-rhel9 (all versions)
  - rhelai3/disk-image-cuda-rhel9 (all versions)
published: '2026-09-17'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T16:18:06.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87742'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:69440'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:69470'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-87742'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2530522'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87742.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-87742'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87742'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00759
epssPercentile: 0.534
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T15:19:05.994572Z'
ingestedAt: '2026-09-17T15:20:39.001Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Exploit Intelligence, Red Hat Enterprise Linux AI (RHEL AI) 3 · no fix planned: Exploit Intelligence, Red Hat Enterprise Linux AI (RHEL AI) 3 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87742.json)