SB2026052305 - Multiple vulnerabilities in NanoMQ

Description

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference (CVE-ID: CVE-2026-32134)

CWE-ID: CWE-476 - NULL Pointer Dereference

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

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

The vulnerability exists due to a null pointer dereference in tcptran_pipe_peer when restoring session state during high-concurrency reconnect handling. A remote attacker can send a specially crafted reconnect-collision payload to cause a denial of service.

The issue is triggered when clean_start=0 session restore overlaps with client ID collision churn during concurrent TCP reconnects.

2) Type Confusion (CVE-ID: CVE-2026-44640)

CWE-ID: CWE-843 - Type confusion

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

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

The vulnerability exists due to type confusion in nng/src/supplemental/quic/msquic_dial.c when closing a QUIC dialer with a pending dial AIO. A remote attacker can trigger the dialer close path to cause a denial of service.

User interaction is required to initiate the vulnerable local code path.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2
• https://github.com/nanomq/nanomq/security/advisories
• https://github.com/nanomq/nanomq/security/advisories/GHSA-9fgw-v323-jmjj