CVE-2026-33216 — Plaintext Storage of a Password in Nats-server

CWE-256 — Plaintext Storage of a PasswordCWE-213 — Exposure of Sensitive Information Due to Incompatible Policies8 documents6 sources
Severity
7.5HIGHNVD
EPSS
0.0%
top 86.79%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Nats-io Nats-serverLinuxfoundation Nats-serverGithub.com Nats-io Nats-server V2+1 more
Timeline
PublishedMar 25
Latest updateMar 26

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 …

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitability: 3.9 | Impact: 3.6

Affected Packages5 packages

▶debiandebian/nats-server< nats-server 2.12.6-1 (forky)
▶CVEListV5nats-io/nats-server< 2.11.15+1
▶NVDlinuxfoundation/nats-server2.12.0 — 2.12.6+1
▶Gogithub.com/nats-io_nats-server_v22.12.0-RC.1 — 2.12.6+1
▶Debianlinuxfoundation/nats-server< 2.12.6-1

Patches

Patch: github.com ↗

🔴Vulnerability Details

4
OSV
NATS has MQTT plaintext password disclosure in github.com/nats-io/nats-server↗2026-03-26
▶
OSV
CVE-2026-33216: NATS-Server is a High-Performance server for NATS↗2026-03-25
▶
GHSA
NATS has MQTT plaintext password disclosure↗2026-03-24
▶
OSV
NATS has MQTT plaintext password disclosure↗2026-03-24
▶

📋Vendor Advisories

2
Red Hat
nats-server: github.com/nats-io/nats-server: NATS-Server: Information disclosure of MQTT passwords through monitoring endpoints↗2026-03-25
▶
Debian
CVE-2026-33216: nats-server - NATS-Server is a High-Performance server for NATS.io, a cloud and edge native me...↗2026
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-33216 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶