CVEvulnerability
CVE-2026-42209
6.5 MEDIUM
Official page ↗
- Status
- Deferred
- Published
- 2026-05-08
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-369
Description
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.
Related
Weakness · CWE (1)
- CWE-369 Divide By Zero weakness
References
- https://github.com/halfgaar/FlashMQ/commit/193b6e7767889511cfa8e933908ea5e6a1077a1f github.com
- https://github.com/halfgaar/FlashMQ/issues/167 github.com
- https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.1 github.com
- https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-2789-vfcg-5922 github.com
- https://github.com/halfgaar/FlashMQ/issues/167 github.com