NATS-Server Vulnerability in JetStream Admin API Permissions
CVE-2026-33222

4.9MEDIUM

Key Information:

Vendor

Nats-io

Status
Nats-server
Vendor
CVE Published:
25 March 2026

What is CVE-2026-33222?

NATS-Server, a high-performance cloud messaging system, presents a vulnerability allowing users with JetStream admin API access to restore one stream to unintended other stream names. This flaw undermines data security by allowing potential unauthorized data manipulation. Versions 2.11.15 and 2.12.6 have addressed this issue. As an immediate precaution, developers should consider removing restore permissions for users configured with limited access until the necessary updates are applied.

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Deploy the Patch

Affected Version(s)

nats-server < 2.11.15 < 2.11.15

nats-server >= 2.12.0-RC.1, < 2.12.6 < 2.12.0-RC.1, 2.12.6

References

https://github.com/nats-io/nats-server/security/advisorie...
x_refsource_CONFIRM
https://advisories.nats.io/CVE/secnote-2026-12.txt
x_refsource_MISC

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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