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6 vulnerabilities found for FlashMQ by halfgaar
CVE-2026-46411 (GCVE-0-2026-46411)
Vulnerability from nvd – Published: 2026-06-09 23:01 – Updated: 2026-06-10 14:30
VLAI
Title
FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older
Summary
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 therefore causes a server abort. This issue has been patched in version 1.26.2.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/halfgaar/FlashMQ/security/advi… | x_refsource_CONFIRM |
| https://github.com/halfgaar/FlashMQ/commit/29e08f… | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/releases/tag/… | x_refsource_MISC |
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CVE-2026-42209 (GCVE-0-2026-42209)
Vulnerability from nvd – Published: 2026-05-08 21:40 – Updated: 2026-05-11 15:59
VLAI
Title
FlashMQ: Division by zero crash when using non-default deferred retained message setting
Summary
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 set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been patched in version 1.26.1.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-369 - Divide By Zero
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/halfgaar/FlashMQ/security/advi… | x_refsource_CONFIRM |
| https://github.com/halfgaar/FlashMQ/issues/167 | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/commit/193b6e… | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/releases/tag/… | x_refsource_MISC |
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CVE-2025-62723 (GCVE-0-2025-62723)
Vulnerability from nvd – Published: 2025-10-24 20:16 – Updated: 2025-10-24 20:32
VLAI
Title
FlashMQ does not release memory of queued QoS messages
Summary
FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/halfgaar/FlashMQ/security/advi… | x_refsource_CONFIRM |
| https://github.com/halfgaar/FlashMQ/issues/154 | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/commit/e86c49… | x_refsource_MISC |
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CVE-2026-46411 (GCVE-0-2026-46411)
Vulnerability from cvelistv5 – Published: 2026-06-09 23:01 – Updated: 2026-06-10 14:30
VLAI
Title
FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older
Summary
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 therefore causes a server abort. This issue has been patched in version 1.26.2.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/halfgaar/FlashMQ/security/advi… | x_refsource_CONFIRM |
| https://github.com/halfgaar/FlashMQ/commit/29e08f… | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/releases/tag/… | x_refsource_MISC |
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CVE-2026-42209 (GCVE-0-2026-42209)
Vulnerability from cvelistv5 – Published: 2026-05-08 21:40 – Updated: 2026-05-11 15:59
VLAI
Title
FlashMQ: Division by zero crash when using non-default deferred retained message setting
Summary
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 set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been patched in version 1.26.1.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-369 - Divide By Zero
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/halfgaar/FlashMQ/security/advi… | x_refsource_CONFIRM |
| https://github.com/halfgaar/FlashMQ/issues/167 | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/commit/193b6e… | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/releases/tag/… | x_refsource_MISC |
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CVE-2025-62723 (GCVE-0-2025-62723)
Vulnerability from cvelistv5 – Published: 2025-10-24 20:16 – Updated: 2025-10-24 20:32
VLAI
Title
FlashMQ does not release memory of queued QoS messages
Summary
FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/halfgaar/FlashMQ/security/advi… | x_refsource_CONFIRM |
| https://github.com/halfgaar/FlashMQ/issues/154 | x_refsource_MISC |
| https://github.com/halfgaar/FlashMQ/commit/e86c49… | x_refsource_MISC |
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