{"id":"CVE-2026-8618","aliases":["EUVD-2026-91006","GHSA-fxpm-c4jc-x283"],"status":"published","title":"Pre-Authentication Stack-based Buffer Overflow Remote Code Execution in TDDPv2 Subtype 0x91 on Deco M9 Plus","description":"A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.","severity":{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00263,"percentile":0.1831,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-10-01T18:16:32Z","modified":"2026-10-01T21:33:02Z","products":[{"vendor":"tp-link systems inc.","product":"deco m9 plus v2"}],"references":[{"url":"https://www.tp-link.com/en/support/download/deco-m9-plus/v2/#Firmware","tags":["patch"]},{"url":"https://www.tp-link.com/us/support/download/deco-m9-plus/v2/#Firmware","tags":["patch"]},{"url":"https://www.tp-link.com/us/support/faq/5322/","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8618"},{"url":"https://www.tp-link.com/us/support/faq/5322"},{"url":"https://github.com/advisories/GHSA-fxpm-c4jc-x283"}],"sources":{"cve":[{"id":"CVE-2026-8618","title":"Pre-Authentication Stack-based Buffer Overflow Remote Code Execution in TDDPv2 Subtype 0x91 on Deco M9 Plus","description":"A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.","status":"published","published":"2026-10-01T18:16:32.107Z","modified":"2026-10-01T18:36:18.919Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","level":"high","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T13:48:02.226896Z"}],"euvd":[{"id":"EUVD-2026-91006","description":"A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.","status":"published","published":"2026-10-01T18:16:32Z","modified":"2026-10-01T18:36:18Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","level":"high"}],"updated_at":"2026-11-02T17:27:43.966642Z"}],"ghsa":[{"id":"GHSA-fxpm-c4jc-x283","title":"A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco...","description":"A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.","status":"published","published":"2026-10-01T21:32:51Z","modified":"2026-10-01T21:33:02Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:12:41.196374Z"}],"nvd":[{"id":"CVE-2026-8618","description":"A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.","status":"published","published":"2026-10-01T19:17:25.34Z","modified":"2026-10-01T20:36:38.33Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:12:53.41762Z"}]}}