Heap buffer overflow RCE in NoMachine mDNS parsing
NoMachine fails to check the length of mDNS resource records before copying them into a heap buffer. A network-adjacent attacker can send crafted records without authentication or user interaction and run arbitrary code as the service account. Affected installations of NoMachine are impacted; NoMachine has not listed affected builds.
What to do: Apply NoMachine's update for CVE-2026-92208. No fixed version or workaround is stated.
| Product | Affected |
|---|---|
| NoMachine | — |
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
NoMachine mDNS Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NoMachine. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of mDNS resource records. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-30982.
ZDI disclosed CVE-2026-92208, an unauthenticated heap-based buffer overflow in NoMachine's mDNS service enabling network-adjacent remote code execution (CVSS 8.8).
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