Is CVE-2026-33248 actively exploited?

No active exploitation of CVE-2026-33248 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33248 be exploited remotely?

Yes. CVE-2026-33248 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33248?

CVE-2026-33248 has a CVSS score of 4.2 (MEDIUM).

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MEDIUM

CVE-2026-33248

CWE-287Published: March 25, 2026· Updated: Mar 26, 2026

4.2

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.6th

Official Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.

NVD Source

Technical Analysis

CVE-2026-33248 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.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.