WebSocket Connection Flaw in Undertow Affects JBoss EAP and WildFly
CVE-2026-81624

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Apache Camel For Spring Boot 4
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
31 August 2026

What is CVE-2026-81624?

A significant flaw has been identified in Undertow, a versatile web server component utilized in JBoss EAP and WildFly, concerning the management of WebSocket connections. The vulnerability arises from default configuration limits that do not constrain message buffer sizes and session timeouts, which remain set to unlimited. As a result, an attacker can exploit this weakness by sending excessive data or maintaining persistent connections, which may lead to server instability, resource exhaustion, and ultimately, a system crash.

References

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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.