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CVE-2026-58253

NATS Server: Route API Auth Bypass PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
nats-io / nats-serveraffected < 2.11.16; affected >= 2.12.0-preview.1, < 2.12.6

CWE

CWE-287

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.