{"id":"CVE-2026-114549","published":"2026-11-04T00:17:22.627","lastModified":"2026-11-04T00:17:22.627","description":"NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of NoMachine. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the web service, which listens on TCP port 4443 by default. 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-30685.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-122"],"vendors":[],"products":[],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-786/","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A heap-based buffer overflow in NoMachine's nxwebrunner web service (port 4443) allows unauthenticated remote attackers to execute arbitrary code by sending overly long input that overflows a heap buffer due to insufficient length validation.","exploitability":"Highly exploitable as no authentication is required and the flaw is a classic heap overflow without complexity barriers.","blast_radius":"Successful exploitation grants full system compromise under the service account, enabling data theft, lateral movement, or ransomware deployment across the infrastructure.","remediation":"Upgrade to NoMachine version 6.13.90 or later, which contains the vendor's official fix for this vulnerability (ZDI-CAN-30685).","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","heap-overflow","web-service","no-auth","cve-2026-114549"],"model":"garnet-coder","analyzedAt":"2026-11-04T09:49:11.451Z"}}