This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-58209 →
DEBIAN-CVE-2026-58209
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message d...
Original description
The description as published by the source.
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:12
nats-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
nats-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:14
nats-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.14.3-1"}]}]
References
- advisory security-tracker.debian.org