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

Quick assessment

Affected
Red Hat Exploit Intelligence
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 中发现一个安全漏洞。该漏洞允许远程攻击者通过单条连接以比应用程序处理速度更快的速率连续发送消息，从而触发拒绝服务（Denial of Service，DoS）攻击。由于存在无限制的消息缓冲机制以及缺乏读取背压（backpressure）控制，系统会迅速耗尽堆内存空间，最终导致抛出 异常，进而使 Java 虚拟机（JVM）崩溃。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-87742

Vulnerability Information
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Vulnerability Title
Quarkus-websockets-next: denial of service (oom) in quarkus-websockets-next via unbounded message buffering
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Exploit Intelligence - cpe:/a:redhat:exploit_intelligence:0
Red Hat Red Hat build of Quarkus - cpe:/a:redhat:quarkus:3
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 - cpe:/a:redhat:enterprise_linux_ai:3
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 - cpe:/a:redhat:enterprise_linux_ai:3
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 - cpe:/a:redhat:enterprise_linux_ai:3
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 - cpe:/a:redhat:enterprise_linux_ai:3

II. Public POCs for CVE-2026-87742

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III. Intelligence Information for CVE-2026-87742

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Vendor Advisories for CVE-2026-87742 (1)

Other References for CVE-2026-87742 (1)

Same Patch Batch · Red Hat · 2026-09-17 · 8 CVEs total

CVE-2026-86320 7.8 HIGH Flatpak-builder: host code execution via `git am` hook execution in patch source extractio
CVE-2026-92925 7.1 HIGH Redis: redis: out-of-bounds read via crafted cluster bus packets
CVE-2026-76781 5.5 MEDIUM Libxml2: libxml2: null pointer dereference parsing nextcatalog without catalog attribute
CVE-2026-81829 5.3 MEDIUM Smallrye-jwt: quarkus-smallrye-jwt: smallrye-jwt: unauthenticated same-origin ssrf via uns
CVE-2026-92904 4.3 MEDIUM Rubygem-foreman_remote_execution: job output readable without object-level view_job_invoca
CVE-2026-92893 4.3 MEDIUM Rubygem-foreman_ansible: ansible inventory api ignores view_hosts permission filters, expo
CVE-2026-92894 4.3 MEDIUM Rubygem-foreman_ansible: unscoped lookupvalue deletion allows cross-model override value d

IV. Related Vulnerabilities

Same product: Exploit Intelligence
Same vendor: Red Hat
Same weakness: CWE-770

V. Comments for CVE-2026-87742

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