CVE WatchJul 13, 2026

CVE-2026-58254

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace

CVSS

6.5

Medium

EPSS

0.3%

p23

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 13, 2026 · CWE-863

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-08-132026-09-10

Technical description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.

Official references

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