Vulnerability Report

CVE-2026-33249

Title: Publish Permission Bypass in NATS-Server Tracing

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-33249.

CWE Category CWE-863

Published Date Mar 25, 2026

Modified Date Mar 26, 2026

Exploit Status Not Found

Score 4.3 CVSS v3.1

Exploit Probability (EPSS)

0.01%

Vulnerability Summary

CVE-2026-33249: 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.

Impacted Vendors

linuxfoundation 1

Reference Links

https://advisories.nats.io/CVE/secnote-2026-15.txt https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

4.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-33249 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

March 26, 2026 MODIFIED

Vulnerability data updated via NVD.

March 26, 2026 MODIFIED

Vulnerability data updated via NVD.

March 26, 2026 MODIFIED

Vulnerability data updated via NVD.

March 25, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected Stack

No specific products linked.