NATS Server: Subscribe Authz Bypass via Wildcard-Overlap

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Summary

CVECVE-2026-58252
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, an authenticated user could receive messages on denied subjects when a wildcard subscription overlapped with a configured wildcard deny rule but was not a subset of it, and queue subscriptions could also affect delivery to legitimate queue consumers. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-285 | CWE-285 CWE-285: Improper Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

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, < 2.12.7 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/releases/tag/v2.14.0 [email protected] github.com
github.com/nats-io/nats-server/commit/8ced85a11497f86704a95d960281480ce0... [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/a42a6d1e258eb5c3a2190384d31965a4b7... [email protected] github.com
github.com/nats-io/nats-server/security/advisories/GHSA-wh7g-5m82-pmhr [email protected] github.com
github.com/nats-io/nats-server/commit/e611ca9604697b02d8f22beb76037400a9... [email protected] github.com
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