CVE-2026-58210
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductLinuxfoundation Nats-server
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- linuxfoundation nats-server2.12.12, 2.14.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation nats-server | v < 2.12.12, 2.14.0 ≤ v < 2.14.3 | 2.12.12, 2.14.3 |
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