Red Hat Undertow: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-0830 · first 24.03.2026 · updated 24.03.2026 · CVSS 5,9
What it is about
Undertow ist ein Webserver, der als leichtgewichtige und flexible Lösung für moderne Webanwendungen konzipiert ist. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat Undertow ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Red Hat Undertow
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
According to the BSI there is no update yet. The vendor notices below name interim protective measures, if any.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- GitHub Advisory Database vom 2026-03-23 github.com
- Red Hat Bugzilla vom 2026-03-23 bugzilla.redhat.com
- Red Hat Customer Portal access.redhat.com
CVE: CVE-2026-3260
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.