CVE-2026-33223

MEDIUM

NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://advisories.nats.io/CVE/secnote-2026-09.txt

Scores

CVSS v3 6.4
EPSS 0.0021
EPSS Percentile 11.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-290
Status published
Products (5)
linuxfoundation/nats-server < 2.11.15
nats-io/nats-server 0Go
nats-io/nats-server 0 - 2.11.15Go
nats-io/nats-server < 2.11.15
nats-io/nats-server >= 2.12.0-RC.1, < 2.12.6
Published Mar 25, 2026
Tracked Since Mar 26, 2026