CVE-2026-5680— Undertow-core: undertow: denial of service via websocket permessage-deflate processing
Quick assessment
Affected
Red Hat Red Hat JBoss Enterprise Application Platform 8.1
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是美国Undertow组织开源的个灵活高效的 Java Web 服务器。 Undertow存在资源管理错误漏洞，该漏洞源于PerMessageDeflateFunction.largerBuffer()方法使用指数倍增导致内存过度消耗，可能导致拒绝服务。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1499 · Endpoint Denial of ServiceAffected Version Matrix 139
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat build of Apache Camel - HawtIO 4 | any |
unaffected |
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | any |
affected |
| Red Hat | Red Hat Data Grid 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 10 | any |
unaffected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
unaffected |
any |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9 | any |
unaffected |
| Red Hat | Red Hat Fuse 7 | any |
unaffected |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | any |
affected |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | any |
unaffected |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.40.0-8.redhat_00024.1.el10eap< * |
unaffected |
0:4.1.7-1.SP1_redhat_00001.1.el10eap< * |
unaffected | ||
0:2.0.5-1.Final_redhat_00001.1.el10eap< * |
unaffected | ||
0:1.85.0-1.redhat_00001.1.el10eap< * |
unaffected | ||
0:1.2.7-1.redhat_00002.1.el10eap< * |
unaffected | ||
0:801.8.0-1.GA_redhat_00001.1.el10eap< * |
unaffected | ||
0:6.6.54-1.Final_redhat_00001.1.el10eap< * |
unaffected | ||
0:4.1.5-5.redhat_00008.1.el10eap< * |
unaffected | ||
| … +33 more rows | |||
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 | 0:2.40.0-8.redhat_00024.1.el8eap< * |
unaffected |
0:4.1.7-1.SP1_redhat_00001.1.el8eap< * |
unaffected | ||
0:2.0.5-1.Final_redhat_00001.1.el8eap< * |
unaffected | ||
0:1.85.0-1.redhat_00001.1.el8eap< * |
unaffected | ||
0:1.2.7-1.redhat_00002.1.el8eap< * |
unaffected | ||
0:801.8.0-1.GA_redhat_00001.1.el8eap< * |
unaffected | ||
0:6.6.54-1.Final_redhat_00001.1.el8eap< * |
unaffected | ||
0:4.1.5-5.redhat_00008.1.el8eap< * |
unaffected | ||
| … +33 more rows | |||
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 | 0:2.40.0-8.redhat_00024.1.el9eap< * |
unaffected |
0:4.1.7-1.SP1_redhat_00001.1.el9eap< * |
unaffected | ||
0:2.0.5-1.Final_redhat_00001.1.el9eap< * |
unaffected | ||
0:1.85.0-1.redhat_00001.1.el9eap< * |
unaffected | ||
0:1.2.7-1.redhat_00002.1.el9eap< * |
unaffected | ||
0:801.8.0-1.GA_redhat_00001.1.el9eap< * |
unaffected | ||
0:6.6.54-1.Final_redhat_00001.1.el9eap< * |
unaffected | ||
0:4.1.5-5.redhat_00008.1.el9eap< * |
unaffected | ||
| … +33 more rows | |||
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | any |
affected |
any |
affected | ||
any |
unaffected | ||
any |
unaffected | ||
| Red Hat | Red Hat Process Automation 7 | any |
affected |
| Red Hat | Red Hat Single Sign-On 7 | any |
affected |
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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
Vulnerability Title
Undertow 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Undertow是美国Undertow组织开源的个灵活高效的 Java Web 服务器。 Undertow存在资源管理错误漏洞，该漏洞源于PerMessageDeflateFunction.largerBuffer()方法使用指数倍增导致内存过度消耗，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 | - |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.40.0-8.redhat_00024.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:4.1.7-1.SP1_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.0.5-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:1.85.0-1.redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:1.2.7-1.redhat_00002.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:801.8.0-1.GA_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:6.6.54-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:4.1.5-5.redhat_00008.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:3.0.22-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.18.9-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:4.0.5-1.redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:4.0.7-4.redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.1.0-1.redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:3.6.3-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:5.0.31-1.SP2_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:3.1.0-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.2.0-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:7.4.0-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:3.0.1-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:5.1.0-1.Final_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:4.0.11-2.SP1_redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:2.25.4-1.redhat_00003.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | 0:3.2.2-1.redhat_00001.1.el10eap ~ * |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el10
|
|
II. Public POCs for CVE-2026-5680
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-5680
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Vendor Advisories for CVE-2026-5680 (5)
-
-
-
-
-
🔗 RHSA-2026:70230 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
Same Patch Batch · Red Hat · 2026-08-27 · 6 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-2026-80179 | 5.9 MEDIUM | Jwcrypto: jwcrypto: denial of service via malformed jwe tokens |
| CVE-2026-81668 | 5.4 MEDIUM | Rubygem-katello: cross-tenant content view filter rule access and modification via unautho |
| CVE-2026-81893 | 4.7 MEDIUM | Gdk-pixbuf: gdk-pixbuf: invalid write in jpeg icc profile parser on error recovery |
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V. Comments for CVE-2026-5680
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