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VULNERABILITIES

CVE-2026-5680 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:70228 [email protected]
https://access.redhat.com/errata/RHSA-2026:70229 [email protected]
https://access.redhat.com/errata/RHSA-2026:70230 [email protected]
https://access.redhat.com/errata/RHSA-2026:70277 [email protected]
https://access.redhat.com/security/cve/CVE-2026-5680 [email protected]

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-770Allocation of Resources Without Limits or Throttling[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

7 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-5680
NVD Published Date:
Aug 27, 2026
NVD Last Modified:
Sep 22, 2026
Source:
[email protected]
CVE-2026-5680 Details - Not Deferred