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CVE-2026-33223

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CVE-2026-33223

Published: Mar 25, 2026

Modified: Mar 26, 2026

PUBLISHED

CVSS v3.1

6.4

MEDIUM

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.

VendorProductVersions

nats-io

nats-server

affected
< 2.11.15
affected
>= 2.12.0-RC.1, < 2.12.6

Weaknesses (CWE)

CWE-290

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

References

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