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    CVE-2026-58253

    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.

    Published:Jul 8, 2026
    Last Modified:Jul 13, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00388
    CVSS Score:8.8

    Affected Products

    Vendor
    Nats
    Product
    Nats Server

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-58208 (CVSS 6.8) — NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.1…
    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…

    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