UBUNTU-CVE-2026-58251
NATS Server versions prior to 2.14.0, 2.12.7, and 2.11.16 contain a vulnerability where an authenticated user with subscription deny permissions can bypass a plain subject deny rule by using a queue subscription. This occurs because queue-specific deny evaluation can override the plain subject deny result if the queue name itself is not denied. The issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16. Several Ubuntu package versions of nats-server are affected. No known exploits in the wild have been reported.
AI Analysis
Technical Summary
NATS Server is a high-performance messaging server. In affected versions 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 leveraging queue subscriptions. This is due to the queue-specific deny evaluation overriding the plain subject deny result when the queue name itself was not denied. This vulnerability allows bypassing intended subscription restrictions. The issue has been fixed in the specified versions.
Potential Impact
An authenticated user with subscription deny permissions can bypass subject deny rules using queue subscriptions, potentially allowing unauthorized subscription to messages that should be denied. The impact is limited to confidentiality (C:H) with no integrity or availability impact reported. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade nats-server to version 2.14.0, 2.12.7, or 2.11.16 or later, where this vulnerability is fixed. The affected Ubuntu package versions listed should be updated accordingly to these fixed versions or later. No other mitigation is indicated.
UBUNTU-CVE-2026-58251
Description
NATS Server versions prior to 2.14.0, 2.12.7, and 2.11.16 contain a vulnerability where an authenticated user with subscription deny permissions can bypass a plain subject deny rule by using a queue subscription. This occurs because queue-specific deny evaluation can override the plain subject deny result if the queue name itself is not denied. The issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16. Several Ubuntu package versions of nats-server are affected. No known exploits in the wild have been reported.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
NATS Server is a high-performance messaging server. In affected versions 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 leveraging queue subscriptions. This is due to the queue-specific deny evaluation overriding the plain subject deny result when the queue name itself was not denied. This vulnerability allows bypassing intended subscription restrictions. The issue has been fixed in the specified versions.
Potential Impact
An authenticated user with subscription deny permissions can bypass subject deny rules using queue subscriptions, potentially allowing unauthorized subscription to messages that should be denied. The impact is limited to confidentiality (C:H) with no integrity or availability impact reported. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade nats-server to version 2.14.0, 2.12.7, or 2.11.16 or later, where this vulnerability is fixed. The affected Ubuntu package versions listed should be updated accordingly to these fixed versions or later. No other mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58251
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:Pro:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a58b45d68715ace43d6be30
Added to database: 07/16/2026, 10:37:17 UTC
Last enriched: 07/16/2026, 11:35:49 UTC
Last updated: 07/31/2026, 19:24:48 UTC
Views: 5
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