CVE-2026-33249

MEDIUM

NATS: Message tracing can be redirected to arbitrary subject

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://advisories.nats.io/CVE/secnote-2026-15.txt

Scores

CVSS v3 4.3
EPSS 0.0001
EPSS Percentile 1.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-863
Status published
Products (4)
linuxfoundation/nats-server 2.11.0 - 2.11.15
nats-io/nats-server 2.11.0 - 2.11.15Go
nats-io/nats-server >= 2.11.0, < 2.11.15
nats-io/nats-server >= 2.12.0-preview.1, < 2.12.6
Published Mar 25, 2026
Tracked Since Mar 26, 2026