NATS Server: MQTT retained and QoS replay bypass subscribe deny filters

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Summary

CVECVE-2026-58209
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 20:16:53 UTC
Updated2026-07-08 20:16:53 UTC
DescriptionNATS 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, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nats-io Nats-server affected < 2.12.12 Not specified
CNA Nats-io Nats-server affected >= 2.14.0-RC.1, < 2.14.3 Not specified

References

ReferenceSourceLinkTags
github.com/nats-io/nats-server/releases/tag/v2.12.12 [email protected] github.com
github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f63348... [email protected] github.com
github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257... [email protected] github.com
github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg [email protected] github.com
github.com/nats-io/nats-server/releases/tag/v2.14.3 [email protected] github.com
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