CVE-2026-58210

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

Problem types

CWE-400: Uncontrolled Resource Consumption

Product status

References

github.com/...server/security/advisories/GHSA-r72h-j7qq-v6qg

github.com/...ommit/bce9ef39469e610aeddb819194ceb7f7edfc0861

github.com/...ommit/e016e47bbf70304945f2ae9dc397e4862adefaf5

github.com/nats-io/nats-server/releases/tag/v2.12.12

github.com/nats-io/nats-server/releases/tag/v2.14.3

cve.org (CVE-2026-58210)

nvd.nist.gov (CVE-2026-58210)

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