VDB

CVE-2026-5680

CVE-2026-5680 PUBLISHED CVSS 7.5 HIGH

Reported by redhat · Published August 27, 2026

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.

Risk Scores

CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

VendorProductVersions
Red HatRed Hat JBoss Enterprise Application Platform 8.1.8.GA2.3.26.SP3-redhat-00001
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.40.0-8.redhat_00024.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:4.1.7-1.SP1_redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.0.5-1.Final_redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:1.85.0-1.redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:1.2.7-1.redhat_00002.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:801.8.0-1.GA_redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:6.6.54-1.Final_redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:4.1.5-5.redhat_00008.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:3.0.22-1.Final_redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.18.9-1.redhat_00003.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:4.0.5-1.redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:4.0.7-4.redhat_00001.1.el10eap
Red HatRed Hat JBoss Enterprise Application Platform 8.1 for RHEL 100:2.1.0-1.redhat_00001.1.el10eap

…and 262 more

Timeline

  • Aug 27, 2026 Coalition ESS Score
  • Aug 27, 2026 CVE Published
  • Aug 28, 2026 EPSS Score
  • Aug 31, 2026 EPSS Score
  • Sep 2, 2026 Security Advisory
  • Sep 3, 2026 EPSS Score
  • Sep 6, 2026 EPSS Score
  • Sep 9, 2026 EPSS Score
  • Sep 12, 2026 EPSS Score
  • Sep 16, 2026 EPSS Score
  • Sep 18, 2026 EPSS Score
  • Sep 22, 2026 Distribution Patch

References

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