UBUNTU-CVE-2026-58208
NATS Server versions prior to 2.14.3 and 2.12.12 contain a vulnerability where a WebSocket listener could route MQTT-over-WebSocket requests into MQTT handling even if MQTT was not configured. This allows an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. The issue is fixed in versions 2.14.3 and 2.12.12.
AI Analysis
Technical Summary
NATS Server, a high-performance messaging server, has a vulnerability in versions before 2.14.3 and 2.12.12 where the WebSocket listener improperly routes MQTT-over-WebSocket requests into MQTT handling without MQTT being configured. This flaw permits unauthenticated clients with WebSocket access to trigger uninitialized MQTT state, causing a denial of service by crashing the server process. The vulnerability is resolved in versions 2.14.3 and 2.12.12.
Potential Impact
An unauthenticated attacker with access to the WebSocket listener can cause the NATS Server process to crash, resulting in denial of service. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade affected NATS Server versions to 2.14.3 or 2.12.12 or later, where this vulnerability is fixed. No other mitigation is indicated.
UBUNTU-CVE-2026-58208
Description
NATS Server versions prior to 2.14.3 and 2.12.12 contain a vulnerability where a WebSocket listener could route MQTT-over-WebSocket requests into MQTT handling even if MQTT was not configured. This allows an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. The issue is fixed in versions 2.14.3 and 2.12.12.
CVSS v3.1
Score 6.8medium
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, a high-performance messaging server, has a vulnerability in versions before 2.14.3 and 2.12.12 where the WebSocket listener improperly routes MQTT-over-WebSocket requests into MQTT handling without MQTT being configured. This flaw permits unauthenticated clients with WebSocket access to trigger uninitialized MQTT state, causing a denial of service by crashing the server process. The vulnerability is resolved in versions 2.14.3 and 2.12.12.
Potential Impact
An unauthenticated attacker with access to the WebSocket listener can cause the NATS Server process to crash, resulting in denial of service. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade affected NATS Server versions to 2.14.3 or 2.12.12 or later, where this vulnerability is fixed. No other mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58208
- 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: 6a58b46268715ace43d6e8ef
Added to database: 07/16/2026, 10:37:22 UTC
Last enriched: 07/16/2026, 11:37:27 UTC
Last updated: 07/31/2026, 19:24:50 UTC
Views: 6
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.