ByteOS Network

NVD Vulnerability Details :

CVE-2026-42209

Received

Source-security-advisories@github.com

Published At-08 May, 2026 | 22:16

Updated At-11 May, 2026 | 17:16

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been patched in version 1.26.1.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Type: Secondary

Version: 3.1

Base score: 6.5

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE ID	Type	Source
CWE-369	Secondary	security-advisories@github.com

CWE ID: CWE-369

Type: Secondary

Source: security-advisories@github.com

References

Hyperlink	Source	Resource
https://github.com/halfgaar/FlashMQ/commit/193b6e7767889511cfa8e933908ea5e6a1077a1f	security-advisories@github.com	N/A
https://github.com/halfgaar/FlashMQ/issues/167	security-advisories@github.com	N/A
https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.1	security-advisories@github.com	N/A
https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-2789-vfcg-5922	security-advisories@github.com	N/A
https://github.com/halfgaar/FlashMQ/issues/167	134c704f-9b21-4f2e-91b3-4a467353bcc0	N/A