nats-io/nats-server · Security
NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing
- GHSA ID
- GHSA-pwx7-fx9r-hr4h
- CVE ID
- CVE-2026-33223
- Severity
- medium
- Published
- Updated
- CVSS
- 6.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CVSS v3
- 6.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Description
Background
NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.
The nats-server offers a Nats-Request-Info: message header, providing information about a request.
Problem Description
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.
Affected Versions
Any version before v2.12.6 or v2.11.15
Workarounds
None.
CWEs
- CWE-290 · Authentication Bypass by Spoofing