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CVE-2026-33249

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CVE-2026-33249

Published: Mar 25, 2026

Modified: Mar 26, 2026

PUBLISHED

CVSS v3.1

4.3

MEDIUM

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, 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 chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

VendorProductVersions

nats-io

nats-server

affected
>= 2.11.0, < 2.11.15
affected
>= 2.12.0-preview.1, < 2.12.6

Weaknesses (CWE)

CWE-863

CVSS v3.1 Details

CVSS v3.1 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

References

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