CVE-2026-58210

NATS 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, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861	Patch
https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5	Patch
https://github.com/nats-io/nats-server/releases/tag/v2.12.12	Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.14.3	Release Notes
https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:linuxfoundation:nats-server::::::::
	cpe:2.3:a:linuxfoundation:nats-server::::::::

History

No history.

Information

Published : 2026-07-08 20:16

Updated : 2026-07-13 15:14

NVD link : CVE-2026-58210

Mitre link : CVE-2026-58210

CVE.ORG link : CVE-2026-58210

JSON object : View

Products Affected

linuxfoundation

nats-server

CWE

CWE-400

Uncontrolled Resource Consumption

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