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.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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.
Is CVE-2026-58251 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-58251 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-58251?
Upgrade to a fixed release named by Red Hat:
- 2.14.0
- 2.12.7
- 2.11.16
Confirm against the vendor advisory before you patch.
- < 2.14.0
- < 2.12.7
- < 2.11.16
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
- 2.14.0
- 2.12.7
- 2.11.16
Official advisory · high-confidence parse· fetched 11 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 11 days ago·verify at source
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