CVE-2026-87742
Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering
- Published
- Updated
- Reserved
- Assigned by
- redhat
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).
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.76% · top 45% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
Red Hat · Red Hat build of Quarkus 3.27.5.SP2
All versions: unaffected
Red Hat · Red Hat build of Quarkus 3.33.3.SP2
All versions: unaffected
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
What to do
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.
References (4)
- RHSA-2026:69440 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:69470 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-87742 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2530522 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-87742)Record last updated .