CVE-2026-87742Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering
Updated under an hour ago ()
Does this affect you?
It affects Red Hat build of Quarkus 3.27.5.SP2 and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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).
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Quarkus 3.27.5.SP2 redhat:quarkus | 3.27 | CNA record |
Red Hat Exploit Intelligence redhat:exploit_intelligence | 0 | CNA record |
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 redhat:enterprise_linux_ai | 3 | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:69440vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:69470vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-87742vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2530522issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.