NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

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Summary

CVECVE-2026-58213
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 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

Problem Types: CWE-74 | CWE-74 CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nats-io Nats-server affected < 2.12.9 Not specified
CNA Nats-io Nats-server affected >= 2.14.0-RC.1, < 2.14.1 Not specified

References

ReferenceSourceLinkTags
github.com/nats-io/nats-server/releases/tag/v2.12.9 [email protected] github.com
github.com/nats-io/nats-server/releases/tag/v2.14.1 [email protected] github.com
github.com/nats-io/nats-server/pull/8164 [email protected] github.com
github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e3367... [email protected] github.com
github.com/nats-io/nats-server/pull/8163 [email protected] github.com
github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0... [email protected] github.com
github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf23... [email protected] github.com
github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f [email protected] github.com
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