CVE-2026-33247

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, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

• CWE-215
• CWE-214

• https://advisories.nats.io/CVE/secnote-2026-14.txtMitigation, Vendor Advisory
• https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvvMitigation, Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:21769
• https://access.redhat.com/errata/RHSA-2026:22347
• https://access.redhat.com/errata/RHSA-2026:23345
• https://access.redhat.com/security/cve/CVE-2026-33247
• https://bugzilla.redhat.com/show_bug.cgi?id=2451486
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33247.json

Published

Mar 25, 2026

Last Modified

Aug 10, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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