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Back to active CVEs
High · CVSS 7.5CVE-2026-87742

Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message bufferingCVE-2026-87742

Answer in brief

CVE-2026-87742 records a High severity (CVSS 7.5) vulnerability in Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering. The current sources do not mark it as known exploited. The current feed maps Red Hat/exploit-intelligence/agent-client-rhel9 (generic), Red Hat/rhelai3/bootc-cuda-rhel9 (generic), Red Hat/rhelai3/bootc-gaudi-rhel9 (generic), Red Hat/rhelai3/bootc-rocm-rhel9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Oct 9, 2026Source checked Nov 1, 2026First seen by HOL Sep 17, 2026Material review Oct 9, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 1, 2026
References
4 linked sources
Open source record

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/exploit-intelligence/agent-client-rhel9 (generic), Red Hat/rhelai3/bootc-cuda-rhel9 (generic), Red Hat/rhelai3/bootc-gaudi-rhel9 (generic), Red Hat/rhelai3/bootc-rocm-rhel9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/exploit-intelligence/agent-client-rhel9generic*Not reported
Red Hat/rhelai3/bootc-cuda-rhel9generic*Not reported
Red Hat/rhelai3/bootc-gaudi-rhel9generic*Not reported
Red Hat/rhelai3/bootc-rocm-rhel9generic*Not reported
Red Hat/rhelai3/disk-image-cuda-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/exploit-intelligence/agent-client-rhel9, Red Hat/rhelai3/bootc-cuda-rhel9, Red Hat/rhelai3/bootc-gaudi-rhel9.
  2. 2Review the reported fix. Source-reported 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.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 17, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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).

Quoted source text, attributed separately from HOL analysis.