CVE-2026-33223
Medium
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, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
SeverityMedium
CVSS6.4
Exploit probability—
ProductLinuxfoundation Nats-server
PublishedMar 25, 2026
First seenMar 25, 2026
Weakness typeCWE-290CWE-290
How to fix
Update
- linuxfoundation nats-server2.11.15, 2.12.6 or later
- github.com/nats-io/nats-server/v22.11.15, 2.12.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation nats-server | v < 2.11.15, 2.12.0 ≤ v < 2.12.6 | 2.11.15, 2.12.6 |
| github.com/nats-io/nats-server/v2Go | v < 2.11.15, 2.12.0-RC.1 ≤ v < 2.12.6 | 2.11.15, 2.12.6 |
| github.com/nats-io/nats-serverGo | No range specified | — |
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