{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8618","assignerOrgId":"f23511db-6c3e-4e32-a477-6aa17d310630","state":"PUBLISHED","assignerShortName":"TPLink","dateReserved":"2026-05-14T18:04:17.050Z","datePublished":"2026-10-01T18:16:32.107Z","dateUpdated":"2026-10-01T18:36:18.919Z"},"containers":{"cna":{"providerMetadata":{"orgId":"f23511db-6c3e-4e32-a477-6aa17d310630","shortName":"TPLink","dateUpdated":"2026-10-01T18:16:32.107Z"},"title":"Pre-Authentication Stack-based Buffer Overflow Remote Code Execution in TDDPv2 Subtype 0x91 on Deco M9 Plus","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-121","description":"CWE-121 Stack-based buffer overflow","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-123","descriptions":[{"lang":"en","value":"CAPEC-123 Buffer Manipulation"}]}],"affected":[{"vendor":"TP-Link Systems Inc.","product":"Deco M9 Plus V2","modules":["tddp"],"versions":[{"status":"affected","version":"0","lessThan":"1.9.2 Build 20260818","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<div>A stack-based buffer overflow vulnerability exists in the TDDPv2 service (<code>/usr/bin/tddp</code>) 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 <code>0x91</code> 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.</div>"}]}],"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"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"LOW","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.7,"vectorString":"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"}}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"},"credits":[{"lang":"en","value":"Isa Roovers","type":"finder"}]},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-01T18:35:59.010450Z","id":"CVE-2026-8618","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-01T18:36:18.919Z"}}]}}