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CVE-2026-5680— Undertow-core: undertow: denial of service via websocket permessage-deflate processing

Quick assessment

Affected
Red Hat Red Hat build of Apache Camel for Spring Boot 4
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.

Undertow 中存在一个缺陷。远程攻击者可以通过发送经过 协商的、精心构造的 WebSocket 消息来利用该漏洞。由于 方法采用指数级翻倍策略，这会导致内存消耗过高，从而对受影响的应用程序造成拒绝服务（DoS）攻击。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-5680

Vulnerability Information
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Vulnerability Title
Undertow-core: undertow: denial of service via websocket permessage-deflate processing
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.
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 Red Hat build of Apache Camel for Spring Boot 4 - cpe:/a:redhat:camel_spring_boot:4
Red Hat Red Hat build of Apache Camel - HawtIO 4 - cpe:/a:redhat:apache_camel_hawtio:4
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid:8
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Fuse 7 - cpe:/a:redhat:jboss_fuse:7
Red Hat Red Hat JBoss Enterprise Application Platform 7 - cpe:/a:redhat:jboss_enterprise_application_platform:7
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Process Automation 7 - cpe:/a:redhat:jboss_enterprise_bpms_platform:7
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-5680

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III. Intelligence Information for CVE-2026-5680

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Other References for CVE-2026-5680 (1)

Same Patch Batch · Red Hat · 2026-08-27 · 4 CVEs total

CVE-2026-78002 7.5 HIGH Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() fun
CVE-2026-81658 6.5 MEDIUM Foreman: cross-tenant disclosure of template revisions via unauthorized audit lookup
CVE-2026-81668 5.4 MEDIUM Rubygem-katello: cross-tenant content view filter rule access and modification via unautho

IV. Related Vulnerabilities

Same product: Red Hat build of Apache Camel for Spring Boot 4
Same vendor: Red Hat
Same weakness: CWE-770

V. Comments for CVE-2026-5680

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