{"id":"CVE-2026-111711","revision":"637a52d70f284b65bb828ae0b83faae8","records":[{"revision":"637a52d70f284b65bb828ae0b83faae8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-111711","aliases":[],"title":"Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()","description":"Netcore NR256CN through 1.5.140116 contains a pre-authentication stack overflow vulnerability in the Boa web server's user_ok() function, which copies Basic-auth usernames with unbounded strcpy() calls into 64-byte stack buffers. Unauthenticated attackers can send a username longer than 63 bytes to any protected /router/*.cgi route to crash the main Boa process or potentially execute code.","state":0,"publishedAt":"2026-10-16T17:40:01.282+00:00","modifiedAt":"2026-10-16T21:16:42.07+00:00","affected":[{"ecosystem":"Vendor product","name":"NR256CN","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Netcore\",\n                    \"product\": \"NR256CN\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"1.5.140116\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144d2ad7fa2aff1/2026.10.15-netcore-nr256cn-basic-auth-stack-overflow.md","https://www.vulncheck.com/advisories/netcore-nr256cn-through-1.5.140116-pre-auth-stack-overflow-via-boa-user-ok"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111711","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111711","identifiers":["CVE-2026-111711"]},"retained":false,"historicalAffected":[]}],"coverage":[]}