CVE-2026-33249 Details
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.
A vulnerability in NATS-Server versions 2.11.0 prior to 2.11.15 and 2.12.0 prior to 2.12.6 allows clients using message tracing headers to redirect trace messages to arbitrary subjects, including those the client is not authorized to publish to. The issue arises because the payload, while a valid trace message, is not selected by the client. This vulnerability could lead to unauthorized message delivery on the NATS messaging system.
Users can upgrade to NATS-Server versions 2.11.15 or 2.12.6 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 26, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://advisories.nats.io/CVE/secnote-2026-15.txt | [email protected] | Vendor Advisory |
| https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linuxfoundation nats-server | >= 2.11.0, < 2.11.15 >= 2.12.0, < 2.12.6 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 26, 2026 | Initial Analysis | [email protected] |
| Mar 25, 2026 | New CVE Received | [email protected] |