What is CVE-2026-58208?

CVE-2026-58208 is a medium-severity vulnerability in Nats-io Nats-server, classified under CWE-248. CVSS score: 6.8/10. Published 2026-07-08.

How severe is CVE-2026-58208?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Nats-io Nats-server

CVE-2026-58208

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener could route requests for the MQTT-over-WebSocket path into MQTT handling even when MQTT was…

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Nats-io Nats-server — versions >= 2.14.0-RC.1, < 2.14.3, < 2.12.12

Weakness classification (CWE)

CWE-248

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-58208?: CVE-2026-58208 is a medium-severity vulnerability in Nats-io Nats-server, classified under CWE-248. CVSS score: 6.8/10. Published 2026-07-08.
How severe is CVE-2026-58208?: Medium severity. CVSS v3 base score is 6.8 out of 10.