What is CVE-2026-33247?

CVE-2026-33247 is a high-severity vulnerability in Nats-io Nats-server, classified under Insertion of Sensitive Information Into Debugging Code. CVSS score: 7.4/10. Published 2026-03-25.

How severe is CVE-2026-33247?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Nats-io Nats-server

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), the…

EPSS: 0.000 (3.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Nats-io Nats-server — versions < 2.11.15, >= 2.12.0-RC.1, < 2.12.6

Weakness classification (CWE)

CWE-215 — Insertion of Sensitive Information Into Debugging Code

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv (x_refsource_CONFIRM)
https://advisories.nats.io/CVE/secnote-2026-14.txt (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33247?: CVE-2026-33247 is a high-severity vulnerability in Nats-io Nats-server, classified under Insertion of Sensitive Information Into Debugging Code. CVSS score: 7.4/10. Published 2026-03-25.
How severe is CVE-2026-33247?: High severity. CVSS v3 base score is 7.4 out of 10.