CVE-2026-33217 — HIGH (7.1)

Q: How severe is CVE-2026-33217?

CVE-2026-33217 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-33217?

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. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

CVSS Score

7.1

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Linuxfoundation	Nats-Server	< 2.11.15

Related Weaknesses (CWE)

CWE-863

References

https://advisories.nats.io/CVE/secnote-2026-07.txtVendor Advisory
https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5Vendor Advisory

FAQ

What is CVE-2026-33217?

CVE-2026-33217 is a vulnerability with a CVSS score of 7.1 (HIGH). NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied i...

How severe is CVE-2026-33217?

CVE-2026-33217 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33217?

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