Information Exposure 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-2026-33247 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 Information Exposure through the RedactArgs/os.Args handling in server/opts.go. An attacker can view static credentials such as --user, --pass, or --auth by accessing the monitoring port’s /debug/vars endpoint when the server is started with those secrets on the command line.
Workaround
This vulnerability can be mitigated by storing credentials in a configuration file rather than via command-line arguments, or by not enabling the monitoring port when using secrets in argv.