SB2026071008 - Multiple vulnerabilities in NanoMQ

Description

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference (CVE-ID: CVE-2026-47276)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in "properties_parse()" function. A remote user can pass specially crafted data to the application and perform a denial of service (DoS) attack.

2) Infinite loop (CVE-ID: CVE-2026-61633)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 1.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to an infinite loop in the UNSUBSCRIBE decoder in mqtt_codec.c when processing a malformed UNSUBSCRIBE packet with a zero-length topic name and trailing data. A remote privileged user can send a specially crafted UNSUBSCRIBE packet to cause a denial of service.

User interaction is required because the client must connect to a malicious broker, and affected exploitation targets the client-side MQTTv3.1.1 codec, including bridge mode.

Remediation

Install update from vendor's website.

References

• https://github.com/nanomq/nanomq/security/advisories/GHSA-qq2v-xvxg-3hvf
• https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr