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CVE-2026-33249

NATS: Message tracing can be redirected to arbitrary subject

Published: Mar 25, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-863
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.2%
Top 86.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-863

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

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://advisories.nats.io/CVE/secnote-2026-15.txt
advisories.nats.io
https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j
github.com

Timeline

Published
Mar 25, 2026
Last Updated
Mar 26, 2026

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