CVE-2026-5680

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

HIGH

7.5

CVSS Score

Published: August 27, 2026 at 04:25 PM UTC

Updated: October 20, 2026 at 03:17 PM UTC

9 products affected across 1 vendorJBoss Enterprise Application PlatformEnterprise LinuxSingle Sign on

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Severity

HIGH7.5

Exploit prediction

EPSS 1%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

JBoss Enterprise Application Platform · Red Hatrpm

92%

All versions7

Vendor states this is fixed in 0:1.1.9-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:1.1.9-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:1.1.9-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:1.2.7-1.redhat_00002.1.el10eap (unaffected)

Vendor states this is fixed in 0:1.2.7-1.redhat_00002.1.el8eap (unaffected)

Vendor states this is fixed in 0:1.2.7-1.redhat_00002.1.el9eap (unaffected)

Vendor states this is fixed in 0:1.85.0-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:1.85.0-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:1.85.0-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.0.18-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.0.18-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.0.18-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.0.5-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.0.5-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.0.5-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.1.0-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.1.0-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.1.0-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.18.9-1.redhat_00003.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.18.9-1.redhat_00003.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.18.9-1.redhat_00003.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.2.0-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.2.0-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.2.0-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.25.4-1.redhat_00003.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.25.4-1.redhat_00003.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.25.4-1.redhat_00003.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.3.2-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.3.2-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.3.2-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.3.26-2.SP3_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.3.26-2.SP3_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.3.26-2.SP3_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.40.0-8.redhat_00024.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.40.0-8.redhat_00024.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.40.0-8.redhat_00024.1.el9eap (unaffected)

Vendor states this is fixed in 0:2.6.11-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:2.6.11-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:2.6.11-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:3.0.1-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:3.0.1-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:3.0.1-1.Final_redhat_00001.1el9eap (unaffected)

Vendor states this is fixed in 0:3.0.22-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:3.0.22-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:3.0.22-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:3.0.6-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:3.0.6-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:3.0.6-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:3.1.0-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:3.1.0-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:3.1.0-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:3.2.2-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:3.2.2-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:3.2.2-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:3.6.3-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:3.6.3-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:3.6.3-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:4.0.11-2.SP1_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:4.0.11-2.SP1_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:4.0.11-2.SP1_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:4.0.5-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:4.0.5-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:4.0.5-1.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:4.0.7-4.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:4.0.7-4.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:4.0.7-4.redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:4.1.136-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:4.1.136-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:4.1.136-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:4.1.5-5.redhat_00008.1.el10eap (unaffected)

Vendor states this is fixed in 0:4.1.5-5.redhat_00008.1.el8eap (unaffected)

Vendor states this is fixed in 0:4.1.5-5.redhat_00008.1.el9eap (unaffected)

Vendor states this is fixed in 0:4.1.7-1.SP1_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:4.1.7-1.SP1_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:4.1.7-1.SP1_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:5.0.31-1.SP2_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:5.0.31-1.SP2_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:5.0.31-1.SP2_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:5.1.0-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:5.1.0-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:5.1.0-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:6.6.54-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:6.6.54-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:6.6.54-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:7.4.0-1.Final_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:7.4.0-1.Final_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:7.4.0-1.Final_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:8.1.1-12.GA_redhat_00048.1.el10eap (unaffected)

Vendor states this is fixed in 0:8.1.1-12.GA_redhat_00048.1.el8eap (unaffected)

Vendor states this is fixed in 0:8.1.1-12.GA_redhat_00048.1.el9eap (unaffected)

Vendor states this is fixed in 0:8.1.8-9.GA_redhat_00006.1.el10eap (unaffected)

Vendor states this is fixed in 0:8.1.8-9.GA_redhat_00006.1.el8eap (unaffected)

Vendor states this is fixed in 0:8.1.8-9.GA_redhat_00006.1.el9eap (unaffected)

Vendor states this is fixed in 0:801.8.0-1.GA_redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:801.8.0-1.GA_redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:801.8.0-1.GA_redhat_00001.1.el9eap (unaffected)

Vendor states this is fixed in 0:9.37.4-1.redhat_00001.1.el10eap (unaffected)

Vendor states this is fixed in 0:9.37.4-1.redhat_00001.1.el8eap (unaffected)

Vendor states this is fixed in 0:9.37.4-1.redhat_00001.1.el9eap (unaffected)

Apache Camel for Spring Boot · Red Hatrpm

90%

All versions4

Build of Apache Camel - HawtIO · Red Hatrpm

90%

All versions

Vendor states this is fixed in 4 (unaffected)

Data Grid · Red Hatrpm

90%

All versions8

Enterprise Linux · Red Hatrpm

90%

All versions9

Vendor states this is fixed in 10 (unaffected)

Vendor states this is fixed in 8 (unaffected)

Fuse · Red Hatrpm

90%

All versions

Vendor states this is fixed in 7 (unaffected)

JBoss Enterprise Application Platform Expansion Pack · Red Hatrpm

90%

All versions

Process Automation · Red Hatrpm

90%

All versions7

Single Sign on · Red Hatrpm

90%

All versions7

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (6)

VDB Entryx_refsource_REDHAT

Source: cverecord

https://access.redhat.com/security/cve/CVE-2026-5680

Issue Trackingx_refsource_REDHAT

Source: cverecord

https://bugzilla.redhat.com/show_bug.cgi?id=2455350

Vendor Advisoryx_refsource_REDHAT

Source: cverecord

https://access.redhat.com/errata/RHSA-2026:70228

Vendor Advisoryx_refsource_REDHAT

Source: cverecord

https://access.redhat.com/errata/RHSA-2026:70229

Vendor Advisoryx_refsource_REDHAT

Source: cverecord

https://access.redhat.com/errata/RHSA-2026:70230

Vendor Advisoryx_refsource_REDHAT

Source: cverecord

https://access.redhat.com/errata/RHSA-2026:70277

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHredhat

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-770

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