CVE-2026-58213
High
Description
NATS 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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductLinuxfoundation Nats-server
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-74Injection
How to fix
Update
- linuxfoundation nats-server2.12.9, 2.14.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation nats-server | v < 2.12.9, 2.14.0 ≤ v < 2.14.1 | 2.12.9, 2.14.1 |
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