CVE-2026-46411

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

CVE-2026-46411

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

CVE-2026-46411: Uncaught Exception

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

FlashMQ security vulnerabilities

FlashMQ is a fast and lightweight MQTT proxy server developed by Wiebe Cazemier. Versions of FlashMQ prior to 1.26.2 contained a security vulnerability. This vulnerability stemmed from the ability of authorized clients to submit excessive requests beyond the allowed buffer size, triggering an...

CVE-2026-46411 FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

CVE-2026-46411 FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

CVE-2026-46411 FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

EUVD-2026-35872

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

CVE-2026-46411

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and...

CVE-2026-46411

FlashMQ is the MQTT broker/server affected by CVE-2026-46411. The issue affects versions prior to 1.26.2, where an authorized client can exceed the permitted over-commit of their write buffer, triggering an internal safe-guard exception in a path that is not catchable and causing the server to ab...

CVE-2026-42209

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

CVE-2026-42209

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

CVE-2026-42209 FlashMQ: Division by zero crash when using non-default deferred retained message setting

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

EUVD-2026-28838

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

CVE-2026-42209 FlashMQ: Division by zero crash when using non-default deferred retained message setting

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

CVE-2026-42209

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

CVE-2026-42209

Summary: CVE-2026-42209 affects FlashMQ, a MQTT broker/server for multi-CPU environments. Before v1.26.1, a remote client with retained publish permission can trigger a crash of the FlashMQ broker when both set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are non-d...

CVE-2026-42209 FlashMQ: Division by zero crash when using non-default deferred retained message setting

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

CVE-2026-42209

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both setretainedmessagedefertimeout and setretainedmessagedefertimeoutspread are configured to non-default values,...

PT-2026-39199

Name of the Vulnerable Software and Affected Versions FlashMQ versions prior to 1.26.1 Description A remote client with retained publish permission can cause a denial of service by crashing the broker. This occurs when both set retained message defer timeout and set retained message defer timeout...