CVE-2026-33215

Name: CVE-2026-33215
Creator: NVD / NIST
Published: 2026-03-24T21:16:28.64+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2026-33215 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.24%

15.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linuxfoundation	Nats-Server	>= 2.0.0, < 2.11.15
Linuxfoundation	Nats-Server	>= 2.12.0, < 2.12.5

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

Timeline

Published: Mar 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33215?

How severe is CVE-2026-33215?

CVE-2026-33215 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33215?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33215?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST