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CVE-2026-33246

NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers

Published: Mar 25, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-287
NVD MITRE
6.4CVSSMEDIUM
EPSS Score
0.1%
Top 96.1%
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. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-287CWE-290

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-2026-08.txt
advisories.nats.io
https://github.com/nats-io/nats-server/security/advisories/GHSA-55h8-8g96-x4hj
github.com

Timeline

Published
Mar 25, 2026
Last Updated
Mar 26, 2026

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