CVE-2026-8741

LOW

EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition

Title source: cna
STIX 2.1

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.

References (5)

Core 5
Core References
Vdb Entry vdb-entry
VDB-364329 | EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition
https://vuldb.com/vuln/364329
Signature, Permissions Required signature permissions-required
VDB-364329 | CTI Indicators (IOB, IOC, IOA)
https://vuldb.com/vuln/364329/cti
Third Party Advisory third-party-advisory
Submit #809931 | EMQX EMQX Broker EMQX 6.1.0 (confirmed) Race Condition
https://vuldb.com/submit/809931

Scores

CVSS v3 3.1
EPSS 0.0005
EPSS Percentile 15.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-362
Status published
Products (4)
None/EMQX 6.0
None/EMQX 6.1
None/EMQX 6.2.0
emqx/emqx 5.0.0 - 6.2.0
Published May 17, 2026
Tracked Since May 17, 2026