SB20260424162 - Multiple vulnerabilities in NanoMQ

Description

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2025-59947)

CWE-ID: CWE-120 - Buffer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote user to cause a denial of service and modify data.

The vulnerability exists due to a buffer overflow in PUBLISH packet handling when triggering both shared subscription and vanilla subscription. A remote user can send a specially crafted PUBLISH packet to cause a denial of service and modify data.

User interaction is required.

2) Use-after-free (CVE-ID: CVE-2025-59946)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to use-after-free in the sub info list when processing concurrent subscribe and unsubscribe operations. A remote user can trigger a race condition to execute arbitrary code.

Exploitation requires hitting a specific overlapping race window.

Remediation

Install update from vendor's website.

References

• https://github.com/nanomq/nanomq/security/advisories/GHSA-98f4-cmg8-x7f3
• https://github.com/nanomq/nanomq/security/advisories/GHSA-xg37-23w7-72p5