CVE-2026-8741
EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition
- State
- Published
- Severity
- 2.3 Low
- Published
- May 17, 2026
- Updated
- May 18, 2026
- Reserved
- May 16, 2026
Description
A vulnerability has been found in EMQX up to 6.2.0. This affects an unknown function of the file apps/emqx/src/emqx_persistent_session_ds.erl of the component QoS 2 PUBLISH Packet Handler. Such manipulation leads to race condition. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 3.1 Low | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 3.0 | 3.1 Low | CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 2.0 | 2.1 Low | AV:N/AC:H/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
- CWE-362 Race Condition
Affected Products
| Product | Versions |
|---|---|
EMQXn/a |
|
References
- VDB-364329 | EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race conditionvdb-entry
- VDB-364329 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- Submit #809931 | EMQX EMQX Broker EMQX 6.1.0 (confirmed) Race Conditionthird-party-advisory
- https://github.com/Pathfind-tama/Report_EMQX_MQTTrelated
- https://github.com/Pathfind-tama/Report_EMQX_MQTT/blob/main/MQTT%20QoS%202%20Message%20Duplication%20in%20Persistent%20Sessions.mdexploit
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