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CVE-2026-81624

Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite

Published: Aug 31, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-770
7.5HIGH
NVD MITRE
EPSS Score
0.3%
Top 73.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

Description

Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

Red Hat
commercial·US
Red Hat build of Apache Camel for Spring Boot 4LibraryLibrary
OSS Libraries / generic-library
Red Hat Enterprise Linux 10On-premOS
Operating Systems / linux-distro
Red Hat Fuse 7On-premDev Tool
DevTools & CI / ci-cd
Red Hat JBoss Enterprise Application Platform 7On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 8On-premWeb App
Enterprise Software / itsm-monitoring
Red Hat JBoss Enterprise Application Platform Expansion PackOn-premOS
Operating Systems / linux-distro
Red Hat Single Sign-On 7On-premSecurity Product
Security Products / identity-access-mgmt
and 2 more affected products View all →

Exploitability

Workaround Available
Is your org exposed to CVE-2026-81624?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://access.redhat.com/security/cve/CVE-2026-81624
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2524868
bugzilla.redhat.com

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