This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-15565 →

DEBIAN-CVE-2026-15565

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class tha...

Original description

The description as published by the source.

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:14 undertow

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory security-tracker.debian.org