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CVE-2026-33247

NATS credentials are exposed in monitoring port via command-line argv

Published: Mar 25, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-215
NVD MITRE
7.4CVSSHIGH
EPSS Score
0.3%
Top 79.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

Description

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-215

Affected Products

nats-serverlinuxfoundation
Mixed
AI / ML / ml-framework
nats-servernats-io
On-prem
Databases / cache-message-queue
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest
nats-iooss-projectDatabases

Exploitability

Workaround Available

References

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

Timeline

Published
Mar 25, 2026
Last Updated
Mar 26, 2026

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