CVE-2026-5680

HIGH 7.5

Undertow-core: undertow: denial of service via websocket permessage-deflate processing

CVSS Score

7.5

EPSS Score

0.4%

EPSS Percentile

34th

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.

CWE	CWE-770
Vendor	red hat
Product	red hat jboss enterprise application platform 8.1 for rhel 10
Published	Aug 27, 2026
Last Updated	Sep 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

All versions affected

Red Hat / Red Hat build of Apache Camel for Spring Boot 4

All versions affected

Red Hat / Red Hat build of Apache Camel - HawtIO 4

All versions affected

Red Hat / Red Hat Data Grid 8

All versions affected

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Fuse 7

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 7

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack

All versions affected

Red Hat / Red Hat Process Automation 7

All versions affected

Red Hat / Red Hat Single Sign-On 7

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70228 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70229 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70230 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:70277 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-5680 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2455350

Credits

Red Hat would like to thank Avishek Sarkar and Brian Laub for reporting this issue.