NULL pointer dereference in NanoMQ - CVE-2026-32134
Published: May 23, 2026
Vulnerability identifier: #VU132185
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-32134
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: NanoMQ
Affected software:
NanoMQ
NanoMQ
Detailed vulnerability description
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.
How to mitigate CVE-2026-32134
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.