PT-2026-56560 · Nats.Io · Nats Server

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-58210

NVD

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-58210

Affected Products

Nats Server

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-58210 · Security Note
• https://github.com/nats-io/nats-server/releases/tag/v2.14.3 · Note
• https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg · Note
• https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5 · Note
• https://github.com/nats-io/nats-server/releases/tag/v2.12.12 · Note
• https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861 · Note