{"id":"CVE-2026-66086","aliases":["A-539342791","ASB-A-539342791","EUVD-2026-97142","GHSA-x9v2-w4w8-7v7g","U-3406715"],"status":"published","title":"Stack-based Buffer Overflow in Modem","description":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.","severity":{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00455,"percentile":0.39953,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-121"],"published":"2026-10-12T01:28:35Z","modified":"2026-11-05T16:32:28Z","fixes":[{"ecosystem":"Android","package":":unknown:","fixed_in":["SoCVersion:2026-11-05"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Android","package":":unknown:","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"SoCVersion:0"},{"fixed":"SoCVersion:2026-11-05"}]}],"versions":["SoCVersion"]}],"products":[{"vendor":"unisoc (shanghai) technologies co., ltd.","product":"modem"}],"references":[{"url":"https://www.unisoc.com/en/support/product-security-bulletin/2109454821805424641"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66086"},{"url":"https://github.com/advisories/GHSA-x9v2-w4w8-7v7g"},{"url":"https://source.android.com/security/bulletin/2026-11-01","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-66086","title":"Stack-based Buffer Overflow in Modem","description":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.","status":"published","published":"2026-10-12T01:28:35.334Z","modified":"2026-10-15T18:08:53.064Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:20:12.939084Z"}],"euvd":[{"id":"EUVD-2026-97142","description":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.","status":"published","published":"2026-10-12T01:28:35Z","modified":"2026-10-15T18:08:53Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T17:00:11.403253Z"}],"ghsa":[{"id":"GHSA-x9v2-w4w8-7v7g","title":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper...","description":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.","status":"published","published":"2026-10-12T03:32:55Z","modified":"2026-10-12T03:33:04Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:13:05.860723Z"}],"nvd":[{"id":"CVE-2026-66086","description":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.","status":"published","published":"2026-10-12T02:16:57.6Z","modified":"2026-10-16T19:55:59.74Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:12:56.310333Z"}],"osv":[{"id":"ASB-A-539342791","status":"published","published":"2026-11-01T00:00:00Z","modified":"2026-11-11T16:12:36.322289056Z","updated_at":"2026-11-09T17:05:18.698671Z"}]}}