CVE-2026-33249

MEDIUM
2026-03-24 https://github.com/nats-io/nats-server
4.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 24, 2026 - 20:45 vuln.today
CVE Published
Mar 24, 2026 - 20:37 nvd
MEDIUM 4.3

Tags

Authentication Bypass

Description

### Impact A valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not attacker chosen. ### Patches Fixed in nats-server 2.12.6 & 2.11.15 ### Workarounds None safe to use.

Analysis

A valid NATS client using message tracing headers can be exploited to send trace messages to arbitrary subjects, bypassing publish permission controls. This affects NATS Server versions prior to 2.12.6 and 2.11.15, allowing authenticated clients to violate authorization policies. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +22
POC: 0

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CVE-2026-33249 vulnerability details – vuln.today
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