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    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 not configured, allowing an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. This issue is fixed in versions 2.14.3 and 2.12.12.

    Published:Jul 8, 2026
    Last Modified:Jul 12, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00593
    CVSS Score:6.8

    Affected Products

    Vendor
    Nats
    Product
    Nats Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-58211 (CVSS 5.4) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58207 (CVSS 7.7) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58210 (CVSS 7.5) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58209 (CVSS 4.3) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58214 (CVSS 4.3) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58254 (CVSS 5.3) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58213 (CVSS 7.1) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58250 (CVSS 7.5) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58252 (CVSS 6.5) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    CVE-2026-58253 (CVSS 8.8) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High