Authentication Bypass Affecting nats package, versions <0.3.2-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.02% (7th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-NATS-15801756
  • published28 Mar 2026
  • disclosed25 Mar 2026

Introduced: 25 Mar 2026

NewCVE-2026-33223  (opens in a new tab)
CWE-290  (opens in a new tab)

How to fix?

Upgrade Chainguard nats to version 0.3.2-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nats package and not the nats package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1