CVE-2026-33215 — MEDIUM (6.5)

Q: How severe is CVE-2026-33215?

CVE-2026-33215 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-33215?

Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.

Vulnerability 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 Score

6.5

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

LOW

Affected Products

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

Related Weaknesses (CWE)

CWE-488 CWE-287

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

FAQ

What is CVE-2026-33215?

CVE-2026-33215 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 Me...

How severe is CVE-2026-33215?

CVE-2026-33215 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33215?

Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Nats-Server.