CVE-2026-33215

EUVD-2026-15017
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 3%
Affected Products (NVD)
VendorProductVersion
linuxfoundationnats-server
2.0.0 ≤
𝑥
< 2.11.15
linuxfoundationnats-server
2.12.0 ≤
𝑥
< 2.12.5
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
nats-server
bookworm
vulnerable
forky
2.12.6-1
fixed
sid
2.12.6-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://advisories.nats.io/CVE/secnote-2026-06.tx
https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879