Medium [CVE-2026-58251] Information disclosure due to bypass of subject deny rules via queue subscriptions
This medium-severity Red Hat Linux advisory covers CVE-2026-58251.
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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 with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.
An authenticated user with specific permissions could bypass security rules designed to deny access to certain message subjects. This bypass occurs when a queue subscription is used, allowing the user to access information that should otherwise be restricted.
The consequence is unauthorized information disclosure, potentially exposing sensitive data. 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.
- < 2.14.0
- < 2.12.7
- < 2.11.16
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
- 2.14.0
- 2.12.7
- 2.11.16
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- 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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