CVE-2026-33223
March 25, 2026
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.
Affected Packages
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <v2.11.15Fix Suggestion:
Update to version v2.11.15github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <v2.11.15Fix Suggestion:
Update to version v2.11.15github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <v2.11.15Fix Suggestion:
Update to version v2.11.15Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.03
