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Internal identity header Nats-Request-Info spoofable

Moderate
philpennock published GHSA-pwx7-fx9r-hr4h Mar 24, 2026

Package

gomod github.com/nats-io/nats-server/v2 (Go)

Affected versions

<= 2.12.5, <= 2.11.14

Patched versions

2.12.6, 2.11.15

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.

References

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVE ID

CVE-2026-33223

Weaknesses

No CWEs
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