{"schema":"threatline.record/2","record":{"id":"CVE-2026-111711","aliases":[],"summary":"Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()","details":"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.","categories":["Unclassified"],"product":"NR256CN","vendor":"Netcore","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-111711","source_modified_at":"2026-10-16T21:16:42.070Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"NR256CN","vendor":"Netcore","versions":[{"version":"0","lessThanOrEqual":"1.5.140116","status":"affected","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00492,"percentile":0.41374,"score_date":"2026-10-23"},"published_at":"2026-10-16T17:40:01.282Z","modified_at":"2026-10-16T21:16:42.070Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-111711","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-16T21:16:42.070Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-111711","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/lukadqq/netcore-router-public-refs/blob/a44d562736b41c944223297e9144d2ad7fa2aff1/2026.10.15-netcore-nr256cn-basic-auth-stack-overflow.md","tags":["third-party-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/netcore-nr256cn-through-1.5.140116-pre-auth-stack-overflow-via-boa-user-ok","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-16T20:53:29.394899Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-16T21:16:42.070Z","content_hash":"9cf017dc435ed78348d480e8a7da37100dd21488fe632c3bb66755423d22adf2"}}