Security Advisory

CVE-2026-58253

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 19:43:13

Last updated 2026-07-09 13:35:24

Assigner GitHub_M

CVSS score 8.8

State PUBLISHED

Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

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