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CVE-2026-8741— EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition

Quick assessment

Affected
n/a EMQX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

EMQX是EMQX公司的一个MQTT消息服务器。 EMQX 6.2.0及之前版本存在竞争条件问题漏洞，该漏洞源于QoS 2 PUBLISH Packet Handler组件中emqx_persistent_session_ds.erl文件的未知函数存在竞争条件。攻击者可能远程利用此漏洞，但攻击复杂度较高。

CVSS 3.1 · Low EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
n/a EMQX 6.0 affected
6.1 affected
6.2.0 affected
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I. Basic Information for CVE-2026-8741

Vulnerability Information
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Vulnerability Title
EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
EMQX 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EMQX是EMQX公司的一个MQTT消息服务器。 EMQX 6.2.0及之前版本存在竞争条件问题漏洞，该漏洞源于QoS 2 PUBLISH Packet Handler组件中emqx_persistent_session_ds.erl文件的未知函数存在竞争条件。攻击者可能远程利用此漏洞，但攻击复杂度较高。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- EMQX 6.0 cpe:2.3:a:emqx:emqx:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8741

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III. Intelligence Information for CVE-2026-8741

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Vendor Advisories for CVE-2026-8741 (1)

Proof of Concept for CVE-2026-8741 (1)

Same Patch Batch · n/a · 2026-05-17 · 11 CVEs total

CVE-2026-8747 6.3 MEDIUM Z-BlogPHP Commend Approval c_system_event.php CheckComment improper authorization
CVE-2026-8743 6.3 MEDIUM Open5GS AMF/MME context.c ran_ue_find_by_amf_ue_ngap_id improper authorization
CVE-2026-8724 4.7 MEDIUM Dataease Data Dashboard SqlparserUtils.java SqlparserUtils.transFilter sql injection
CVE-2026-8746 4.3 MEDIUM Open5GS NRF nghttp2-server.c discover_handler use after free
CVE-2026-8745 4.3 MEDIUM Open5GS AUSF nausf-handler.c ogs_timer_add denial of service
CVE-2026-8744 4.3 MEDIUM Open5GS NRF context.c ogs_sbi_nf_service_add denial of service
CVE-2026-8731 4.3 MEDIUM Open5GS NRF client.c ogs_sbi_client_add denial of service
CVE-2026-8730 4.3 MEDIUM Open5GS NRF context.c ogs_sbi_nf_instance_set_id denial of service
CVE-2026-8729 4.3 MEDIUM Open5GS NRF message.c denial of service
CVE-2026-8728 4.3 MEDIUM Open5GS NRF conv.c ogs_sbi_discovery_option_parse_plmn_list denial of service

IV. Related Vulnerabilities

Same product: EMQX
Same vendor: n/a
Same weakness: CWE-362

V. Comments for CVE-2026-8741

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