🛡️ CVE-2026-33215 on Debian — nats-server

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.

Distribution advisory

This page covers CVE-2026-33215 as tracked by Debian, for the package nats-server. The fix is available in version 2.12.6-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Affected software

DEBIAN-CVE-2026-33215 is recorded against 1 package.

nats-server (fixed in 2.12.6-1)

Timeline and source

Published on 24 March 2026 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2026-33215 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Base record Go (Root.io)Ubuntu

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-03-24

Updated 2026-08-20

Modified 2026-08-04

Fix URL N/A

Affected Packages

Software	From version	Fixed in
nats-server	—	2.12.6-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2026-33215

🔗 NVD 🔗 Mitre

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