User Impersonation Affecting github.com/nats-io/nats-server/v2/server package, versions <2.11.15>=2.12.0-RC.1 <2.12.6
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Mar 2026
- disclosed24 Mar 2026
- creditUnknown
Introduced: 24 Mar 2026
CVE-2026-33215 Â (opens in a new tab)How to fix?
Upgrade github.com/nats-io/nats-server/v2/server to version 2.11.15, 2.12.6 or higher.
Overview
github.com/nats-io/nats-server/v2/server is an A simple, secure and performant communications system for digital systems, services and devices.
Affected versions of this package are vulnerable to User Impersonation through the createOrRestoreSession function in the MQTT session manager. An attacker can restore or overwrite another client’s session state and hijack messages by connecting with a colliding MQTT Client ID.