VulnerabilityAnalyzed

CVE-2026-33215

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system.

MEDIUM 6.5EPSS 0.24%

Does this matter?

Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.24% probability · 16th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-287, CWE-488
Affected: linuxfoundation/nats-server
Source: security-advisories@github.com

EPSS trend

EPSS 0.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

https://advisories.nats.io/CVE/secnote-2026-06.txBroken Link
https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.