CVE-2026-87742: Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering
Red Hat · Red Hat build of Quarkus 3.27.5.SP2
Vendor fix available · Affected: Red Hat build of Quarkus 3.27.5.SP2 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 55% of scored CVEs
DescriptionCVE.org
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).
Affected products7
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Red Hat build of Quarkus 3.27.5.SP2Versions not stated
- Red Hat · Red Hat build of Quarkus 3.33.3.SP2Versions not stated
- Red Hat · Exploit IntelligenceVersions not stated
- Red Hat · Red Hat Enterprise Linux AI (RHEL AI) 3Versions not stated
- Red Hat · Red Hat Enterprise Linux AI (RHEL AI) 3Versions not stated
- Red Hat · Red Hat Enterprise Linux AI (RHEL AI) 3Versions not stated
- Red Hat · Red Hat Enterprise Linux AI (RHEL AI) 3Versions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Red Hat
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-87742 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.