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.
Published: 2026-08-27
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

Vendor Workaround

To mitigate this issue, configure the PerMessageDeflateHandshake to limit the maximum decompressed buffer size. This can be achieved by setting the maxDecompressedBufferSize parameter to a reasonable value (e.g., 10 MB) in the PerMessageDeflateHandshake constructor. This action may require a restart of the affected application or service to take effect.

Tracking

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Advisories

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History

Thu, 27 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
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.
Title Undertow-core: undertow: denial of service via websocket permessage-deflate processing
First Time appeared Redhat
Redhat apache Camel Hawtio
Redhat camel Spring Boot
Redhat enterprise Linux
Redhat jboss Data Grid
Redhat jboss Enterprise Application Platform
Redhat jboss Enterprise Bpms Platform
Redhat jboss Fuse
Redhat jbosseapxp
Redhat red Hat Single Sign On
Weaknesses CWE-770
CPEs cpe:/a:redhat:apache_camel_hawtio:4
cpe:/a:redhat:camel_spring_boot:4
cpe:/a:redhat:jboss_data_grid:8
cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jboss_enterprise_bpms_platform:7
cpe:/a:redhat:jboss_fuse:7
cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:red_hat_single_sign_on:7
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat apache Camel Hawtio
Redhat camel Spring Boot
Redhat enterprise Linux
Redhat jboss Data Grid
Redhat jboss Enterprise Application Platform
Redhat jboss Enterprise Bpms Platform
Redhat jboss Fuse
Redhat jbosseapxp
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Redhat Apache Camel Hawtio Camel Spring Boot Enterprise Linux Jboss Data Grid Jboss Enterprise Application Platform Jboss Enterprise Bpms Platform Jboss Fuse Jbosseapxp Red Hat Single Sign On
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-27T16:25:29.103Z

Reserved: 2026-04-06T09:46:16.983Z

Link: CVE-2026-5680

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-27T17:18:58.397

Modified: 2026-08-27T17:18:58.397

Link: CVE-2026-5680

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-770

    Allocation of Resources Without Limits or Throttling