NATS Server: Route API Auth Bypass

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Summary

CVECVE-2026-58253
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 20:16:54 UTC
Updated2026-07-08 20:16:54 UTC
DescriptionNATS 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

Problem Types: CWE-287 | CWE-287 CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
Low

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nats-io Nats-server affected < 2.11.16 Not specified
CNA Nats-io Nats-server affected >= 2.12.0-preview.1, < 2.12.6 Not specified

References

ReferenceSourceLinkTags
github.com/nats-io/nats-server/releases/tag/v2.12.7 [email protected] github.com
github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45 [email protected] github.com
github.com/nats-io/nats-server/releases/tag/v2.14.0 [email protected] github.com
github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc... [email protected] github.com
github.com/nats-io/nats-server/releases/tag/v2.11.16 [email protected] github.com
github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c76628279... [email protected] github.com
github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f72... [email protected] github.com
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