Bug#1147427: undertow: CVE-2026-81624

[Moritz Mühlenhoff]

Source: undertow
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerability was published for undertow.

CVE-2026-81624[0]:
| 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.

https://bugzilla.redhat.com/show_bug.cgi?id=2524868


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-81624
    https://www.cve.org/CVERecord?id=CVE-2026-81624

Please adjust the affected versions in the BTS as needed.