CVE-2026-58254 | NATS Server is a high-performance server for NATS.io, the cl… | CVSS 5.3 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.

Metadata

CVE ID: CVE-2026-58254
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-29 21:54 UTC
Published: 2026-07-08 19:56 UTC
Last updated: 2026-07-08 19:56 UTC
Primary CWE: CWE-863
CWE-863: Incorrect Authorization
Vendor / Product: nats-io / nats-server
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 4.0

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

Affected products (1)

Vendor	Product	Platform	Versions
nats-io	nats-server	—	< 2.12.8, >= 2.14.0-RC.1, < 2.14.3

Weakness (CWE)

CWE	Source	Description
CWE-863	cna	CWE-863: Incorrect Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	4.0	cna	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

References (4)

https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h
https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd
https://github.com/nats-io/nats-server/releases/tag/v2.12.8 https://github.com/nats-io/nats-server/releases/tag/v2.12.8
https://github.com/nats-io/nats-server/releases/tag/v2.14.3 https://github.com/nats-io/nats-server/releases/tag/v2.14.3