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CVE-2026-58208
6.8 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): High (H)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Changed (C)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): High (H)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created suggestion
NATS Server: MQTT-over-WebSocket Path Can Crash WebSocket-Only JetStream Servers Before MQTT Is Enabled
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener could route requests for the MQTT-over-WebSocket path into MQTT handling even when MQTT was not configured, allowing an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. This issue is fixed in versions 2.14.3 and 2.12.12.
References
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https://github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g x_refsource_CONFIRM
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https://github.com/nats-io/nats-server/releases/tag/v2.12.12 x_refsource_MISC
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https://github.com/nats-io/nats-server/releases/tag/v2.14.3 x_refsource_MISC
Affected products
nats-server
- ==>= 2.14.0-RC.1, < 2.14.3
- ==< 2.12.12
Package maintainers
-
@derekcollison Derek Collison <derek@nats.io>
-
@swdunlop Scott W. Dunlop <swdunlop@gmail.com>