This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-5680 →
DEBIAN-CVE-2026-5680
A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-defla...
Original description
The description as published by the source.
A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:14
undertow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory security-tracker.debian.org