CVE-2025-62723: flashmq — Fix

Description

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue.

Is your site exposed to CVE-2025-62723?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

4.3

MEDIUM

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

Weakness Type (CWE)

CWE-772 CWE-772

Affected Products

Vendor	Product	Versions
flashmq	flashmq	< 1.23.2

References

Advisories & Patches

https://github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9 https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv

Other References

https://github.com/halfgaar/FlashMQ/issues/154

Frequently Asked Questions

What is CVE-2025-62723? +

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-62723? +

CVE-2025-62723 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-62723? +

CVE-2025-62723 affects products from flashmq, specifically: flashmq. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62723? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-65947

thread-amount is a tool that gets the amount of threads in the current process. Prior to version 0.2.2, there are …

CVE-2026-35227

An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race …

CVE-2026-45287

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.0.17, `go.opentelemetry.io/otel/schema/v1.0` and `go.opentelemetry.io/otel/schema/v1.1` leaks one file descriptor on each …

CVE-2025-3864

Hackney fails to properly release HTTP connections to the pool after handling 307 Temporary Redirect responses. Remote attackers can exploit …

CVE-2025-30256 8.6

A denial of service vulnerability exists in the HTTP Header Parsing functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted …

CVE-2024-2398 8.6

When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers for the …

CVE-2025-62723