CVE-2026-58254

medium

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.

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h

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

https://github.com/nats-io/nats-server/releases/tag/v2.12.8

https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd

Details

Source: Mitre, NVD

Published: 2026-07-08

Updated: 2026-07-13

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Severity: Medium

CVSS v4

Base Score: 5.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00428