CVE-2026-33216

Name	CVE-2026-33216
Description	NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nats-server (PTS)	bookworm	2.9.10-1	vulnerable
	trixie	2.10.27-1	vulnerable
	forky	2.12.4-1	vulnerable
	sid	2.12.6-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nats-server	source	(unstable)	(unfixed)

Notes

https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc
Fixed by: https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099 (v2.12.6)
https://advisories.nats.io/CVE/secnote-2026-05.txt