TI-2026-07683 Aliases CVE-2026-8741 GHSA-48p2-hcwr-rx4q

EMQX QoS 2 PUBLISH Packet emqx_persistent_session_ds.erl race condition

MEDIUM 45CWE-362Published 2026-05-17 · Updated 2026-05-18

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00282 20th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	EMQX	6.0; 6.1; 6.2.0	—	No fix listed	CNA

EMQX Vendor— Affected 6.0; 6.1; 6.2.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:emqx:emqx::::::::	5.0.0 – 6.2.0	Vulnerable	nanomq

cpe:2.3:a:emqx:emqx:*:*:*:*:*:*:*:* Versions 5.0.0 – 6.2.0 Vulnerable ·nanomq

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-8741
2026-10-03 Alias added: GHSA-48p2-hcwr-rx4q

References

Exploit 1

https://github.com/Pathfind-tama/Report_EMQX_MQTT/blob/main/MQTT%20QoS%202%20Message%20Duplication%20in%20Persistent%20Sessions.md

Advisory 1

https://github.com/Pathfind-tama/Report_EMQX_MQTT

TI-2023-19269 An issue in the emqx_sn plugin of EMQX v4.3.8 allows attackers to execute a directory… CVSS 3.1MEDIUM 6.5
TI-2021-21231 EMQ X Dashboard V3.0.0 is affected by username enumeration in the "/api /v3/auth"… CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences