Medium6.5Red Hat Linux

Medium [CVE-2026-58252] Information disclosure via access control bypass in wildcard and queue subscriptions

This medium-severity Red Hat Linux advisory covers CVE-2026-58252.

CVE-2026-58252 Published Jul 8, 2026Updated by vendor Jul 8, 2026

CVE-2026-58252

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system.

Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user could receive messages on denied subjects when a wildcard subscription overlapped with a configured wildcard deny rule but was not a subset of it, and queue subscriptions could also affect delivery to legitimate queue consumers. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

A flaw was found in NATS Server. This could lead to unauthorized information disclosure.

Moderate: An information disclosure flaw in NATS Server allows an authenticated user to bypass configured access restrictions, enabling them to receive messages on subjects that should be denied. This occurs when wildcard subscriptions overlap with deny rules or when queue subscriptions interfere with message delivery.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-551.

Red Hat lists Red Hat Hardened Images as not affected.

Affected versions

< 2.14.0
< 2.12.7
< 2.11.16

Official advisory · high-confidence parse· fetched 10 days ago·verify at source

Fixed versions

2.14.0
2.12.7
2.11.16

Official advisory · high-confidence parse· fetched 10 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 10 days ago·verify at source

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