Is CVE-2026-33249 actively exploited?

No active exploitation of CVE-2026-33249 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33249 be exploited remotely?

Yes. CVE-2026-33249 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33249?

CVE-2026-33249 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-33249

CWE-863Published: March 25, 2026· Updated: Mar 26, 2026

4.3

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:6.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33249 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.