CVE-2026-33223

MEDIUM

6.4

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, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

CVE Details

CVSS v3.1 Score6.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/25/2026

Last Modified3/26/2026

Sourcenvd

Honeypot Sightings0

Affected Products

linuxfoundation:nats-server

Weaknesses (CWE)

CWE-290

References

https://advisories.nats.io/CVE/secnote-2026-09.txt(security-advisories@github.com)

https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h(security-advisories@github.com)

IOC Correlations

No correlations recorded

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