PT-2026-56560

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.3 NATS Server versions prior to 2.12.12 Description An unauthenticated MQTT client can cause the server to consume excessive memory by sending large incomplete MQTT CONNECT packets. The server retains these...

PT-2026-56559

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.3 NATS Server versions prior to 2.12.12 Description MQTT retained message delivery and QoS1+ durable replay may deliver messages to subscribers even if the original topics match a configured subscribe deny...

PT-2026-56563

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.12.8 NATS Server versions prior to 2.11.17 Description An unauthenticated peer with network access to a leafnode listener with compression enabled can cause the server to crash. This occurs during the...

PT-2026-56581

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.3 NATS Server versions prior to 2.12.12 Description A client capable of sending account-scoped connection monitoring requests can cause the server to crash. This occurs when the client provides Offset and Lim...

PT-2026-56562

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.3 NATS Server versions prior to 2.12.12 Description An authenticated MQTT client can subscribe to the internal $MQTT.deliver.pubrel subject family. This action allows the client to bypass configured subscribe...

PT-2026-56537

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.0 NATS Server versions prior to 2.12.7 NATS Server versions prior to 2.11.16 Description An authenticated user with subscription deny permissions can bypass a plain subject deny rule by utilizing a queue...

PT-2026-56565

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.0 NATS Server versions prior to 2.12.7 NATS Server versions prior to 2.11.16 Description When no auth user is configured, a parser fast path designed for standard client connections may incorrectly apply to...

PT-2026-56561

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.1 NATS Server versions prior to 2.12.9 Description An MQTT client can include protocol control characters in subscription filters. These characters are subsequently forwarded as NATS protocol data to route or...

PT-2026-56583

Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.3 NATS Server versions prior to 2.12.12 Description A flaw exists where a client can be registered as the configured no auth user via a parser path triggered when the initial client operation is not CONNECT...

nats-server: NATS Server: Denial of Service via incomplete MQTT CONNECT packets

A flaw was found in NATS Server. An unauthenticated remote attacker could send large, incomplete MQTT CONNECT packets to the server. This action causes the server to retain these packets, consuming significant memory before authentication is complete. This can lead to a denial of service DoS...

nats-server: NATS Server: Protocol stream corruption and unintended operation injection via MQTT client subscription filters

A flaw was found in NATS Server. An authenticated MQTT client could exploit this by embedding protocol control characters within subscription filters. These characters would then be forwarded as NATS protocol data to route or leafnode connections, leading to the corruption of the protocol stream...

nats-server: NATS Server: Denial of Service via inconsistent message trace destination checks

A flaw was found in NATS Server. Message trace destination checks, which ensure that trace events are sent to authorized subjects, were not consistently applied to messages originating from leafnode connections. This inconsistency allows a leafnode operator to bypass these checks and send trace...

nats-server: NATS Server: Information disclosure due to inconsistent MQTT topic rechecking

A flaw was found in NATS Server. This vulnerability allows for unauthorized information disclosure where MQTT messages, intended to be denied based on subscription rules, are still delivered to subscribers. This occurs because the server's delivery paths do not consistently recheck the original...

nats-server: NATS Server: Authentication bypass allows unauthorized access and information disclosure

A flaw was found in NATS Server, a high-performance messaging system. This vulnerability allows a client to bypass normal authentication and connection restrictions by registering as a "noauthuser" through a specific parser path. This occurs when the client's initial operation is not a standard...

nats-server: NATS Server: Information disclosure via MQTT client subscription bypass

A flaw was found in NATS Server, a high-performance messaging system. An authenticated MQTT Message Queuing Telemetry Transport client could bypass security permissions by subscribing to an internal subject family. This unauthorized access allows the client to view sensitive MQTT Quality of Servi...

nats-server: NATS Server: Information disclosure due to inconsistent MQTT topic rechecking

A flaw was found in NATS Server. This vulnerability allows for unauthorized information disclosure where MQTT messages, intended to be denied based on subscription rules, are still delivered to subscribers. This occurs because the server's delivery paths do not consistently recheck the original...

nats-server: NATS Server: Information disclosure via MQTT client subscription bypass

A flaw was found in NATS Server, a high-performance messaging system. An authenticated MQTT Message Queuing Telemetry Transport client could bypass security permissions by subscribing to an internal subject family. This unauthorized access allows the client to view sensitive MQTT Quality of Servi...

nats-server: NATS Server: Denial of Service via incomplete MQTT CONNECT packets

A flaw was found in NATS Server. An unauthenticated remote attacker could send large, incomplete MQTT CONNECT packets to the server. This action causes the server to retain these packets, consuming significant memory before authentication is complete. This can lead to a denial of service DoS...

nats-server: NATS Server: Denial of Service via inconsistent message trace destination checks

A flaw was found in NATS Server. Message trace destination checks, which ensure that trace events are sent to authorized subjects, were not consistently applied to messages originating from leafnode connections. This inconsistency allows a leafnode operator to bypass these checks and send trace...

nats-server: NATS Server: Authentication bypass allows unauthorized access and information disclosure

A flaw was found in NATS Server, a high-performance messaging system. This vulnerability allows a client to bypass normal authentication and connection restrictions by registering as a "noauthuser" through a specific parser path. This occurs when the client's initial operation is not a standard...