CVE-2026-5680

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

State: Published
Severity: 7.5 High
Published: Aug 27, 2026
Updated: Oct 20, 2026
Reserved: Apr 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
Red Hat JBoss Enterprise Application Platform 8.1.8.GARed Hat	2.3.26.SP3-redhat-00001 and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.40.0-8.redhat_00024.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.1.7-1.SP1_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.0.5-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:1.85.0-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:1.2.7-1.redhat_00002.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:801.8.0-1.GA_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:6.6.54-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.1.5-5.redhat_00008.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.0.22-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.18.9-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.0.5-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.0.7-4.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.1.0-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.6.3-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:5.0.31-1.SP2_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.1.0-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.2.0-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:7.4.0-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.0.1-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:5.1.0-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.0.11-2.SP1_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.25.4-1.redhat_00003.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.2.2-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.1.136-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:4.1.136-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:9.37.4-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:1.1.9-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.0.6-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.0.18-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.3.26-2.SP3_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:8.1.8-9.GA_redhat_00006.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.6.11-1.Final_redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:8.1.1-12.GA_redhat_00048.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:2.3.2-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10Red Hat	0:3.0.6-1.redhat_00001.1.el10eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.40.0-8.redhat_00024.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.1.7-1.SP1_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.0.5-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:1.85.0-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:1.2.7-1.redhat_00002.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:801.8.0-1.GA_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:6.6.54-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.1.5-5.redhat_00008.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.0.22-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.18.9-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.0.5-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.0.7-4.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.1.0-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.6.3-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:5.0.31-1.SP2_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.1.0-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.2.0-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:7.4.0-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.0.1-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:5.1.0-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.0.11-2.SP1_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.25.4-1.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.2.2-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.1.136-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.1.136-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:9.37.4-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:1.1.9-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.0.6-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.0.18-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.3.26-2.SP3_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:8.1.8-9.GA_redhat_00006.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.6.11-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:8.1.1-12.GA_redhat_00048.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.3.2-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:3.0.6-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.40.0-8.redhat_00024.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.1.7-1.SP1_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.0.5-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:1.85.0-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:1.2.7-1.redhat_00002.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:801.8.0-1.GA_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:6.6.54-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.1.5-5.redhat_00008.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.0.22-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.18.9-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.0.5-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.0.7-4.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.1.0-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.6.3-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:5.0.31-1.SP2_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.1.0-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.2.0-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:7.4.0-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.0.1-1.Final_redhat_00001.1el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:5.1.0-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.0.11-2.SP1_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.25.4-1.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.2.2-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.1.136-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.1.136-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:9.37.4-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:1.1.9-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.0.6-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.0.18-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.3.26-2.SP3_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:8.1.8-9.GA_redhat_00006.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.6.11-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:8.1.1-12.GA_redhat_00048.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.3.2-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:3.0.6-1.redhat_00001.1.el9eap and laterNot affected
Red Hat build of Apache Camel for Spring Boot 4Red Hat
Red Hat build of Apache Camel - HawtIO 4Red Hat
Red Hat Data Grid 8Red Hat
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat Fuse 7Red Hat
Red Hat JBoss Enterprise Application Platform 7Red Hat
Red Hat JBoss Enterprise Application Platform 8Red Hat
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
Red Hat Process Automation 7Red Hat
Red Hat Single Sign-On 7Red Hat

References

RHSA-2026:70228vendor-advisory
RHSA-2026:70229vendor-advisory
RHSA-2026:70230vendor-advisory
RHSA-2026:70277vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-5680vdb-entry
RHBZ#2455350issue-tracking

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.