Information Disclosure Vulnerability in NATS-Server by NATS.io

CVE-2026-33247

What is CVE-2026-33247?

NATS-Server, a cloud and edge native messaging system, is susceptible to an information disclosure vulnerability when run with static credentials provided via command line arguments. Users who can access the monitoring port may inadvertently view sensitive credentials, as the '/debug/vars' endpoint exposes an unredacted version of the command-line arguments. To mitigate this issue, it is advised to avoid using command-line arguments for sensitive information, utilize a configuration file for credential management, and limit access to the monitoring port, especially from untrusted networks. Versions 2.11.15 and 2.12.6 have implemented necessary fixes to address this vulnerability.

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References