CVE-2026-33215GO-2026-4833BIT-NATS-2026-33215GHSA-FCJP-H8CC-6879
NATS is vulnerable to MQTT hijacking via Client ID
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 2.11.15, 2.12.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- nats-io nats-server
fixed in 2.11.15; From 2.12.0-RC.1 · fixed in 2.12.6
- github.com/nats-io/nats-serverGo
All versions
- github.com/nats-io/nats-server/v2Go
fixed in 2.11.15; From 2.12.0-RC.1 · fixed in 2.12.6
- github.com/nats-io/nats-server/v2Go
fixed in 2.11.15
- github.com/nats-io/nats-server/v2Go
From 2.12.0-RC.1 · fixed in 2.12.6