CVE-2026-58210

NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory

Published: Jul 8, 2026Updated: Jul 13, 2026 Sources: CVE List NVDCWE-400

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-400

Affected Products

nats-io

oss-project

nats-serverOn-prem

Databases / cache-message-queue

linuxfoundation

oss-project·USaka yocto, pytorch, everest

nats-serverOn-premDatabase

AI / ML / vector-db-rag

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg

github.com

https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861

github.com

https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5

github.com

and 2 more references View all →

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