CVE-2026-8741

LOW 3.1

EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition

CVSS Score

3.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-362
Vendor	n/a
Product	emqx
Published	May 17, 2026
Last Updated	May 18, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

n/a / EMQX

6.0 6.1 6.2.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/364329 vuldb.com: https://vuldb.com/vuln/364329/cti vuldb.com: https://vuldb.com/submit/809931 github.com: https://github.com/Pathfind-tama/Report_EMQX_MQTT github.com: https://github.com/Pathfind-tama/Report_EMQX_MQTT/blob/main/MQTT%20QoS%202%20Message%20Duplication%20in%20Persistent%20Sessions.md

Credits

🔍 CCCaaa (VulDB User) VulDB CNA Team