{"schemaVersion":3,"id":"CVE-2026-102715","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Any host on the LAN can send two mDNS records and make the responder write past the end of its\n\n\n\ntransmit packet.\n\n\n\nThe string table stores each name in a slot rounded up to a multiple of four:\n\n\n\n```c\n\n\n\n/* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */\n\n\n\nmemory_len = ((memory_len & 0xFFFFFFFC) + 8) & 0xFFFFFFFF;\n\n\n\n...\n\n\n\nlen = *((USHORT*)(p - 2));           /* slot size, not string length */\n\n\n\nif ((len == memory_len) && ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...)\n\n\n\n```\n\n\n\nThe lookup that decides whether an incoming name is already stored compares the rounded slot size,\n\n\n\nso names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered\n\n\n\nwith the pointer to the first, and the record then carries a string up to three bytes longer than\n\n\n\nthe length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only\n\n\n\nbound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string.\n\n\n\nTwo PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names\n\n\n\nwhose lengths fall in the same bucket:\n\n\n\n```\n\n\n\n==87491==ERROR: AddressSanitizer: heap-buffer-overflow\n\n\n\nWRITE of size 1 at 0x611000000124 thread T5\n\n    #0 _nx_mdns_name_string_encode  addons/mdns/nxd_mdns.c:13096\n    #1 _nx_mdns_packet_rr_add       addons/mdns/nxd_mdns.c:8911\n\n\n0x611000000124 is 0 bytes to the right of 228-byte region\n\n\n\n```\n\n\n\nThe overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a\n\n\n\nnormal pool that lands in the next packet in the same pool rather than in a redzone, so the visible\n\n\n\neffect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash.\n\n\n\nCompare the slot size against the stored string length before declaring a match, or keep the\n\n\n\nstring length in the slot header and return it to the caller so the encoder and the bound check\n\n\n\nagree.","dates":{"published":"2026-09-29T17:42:35.719Z","modified":"2026-09-29T18:42:21.812Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":7.1,"severity":"high","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00153,"percentile":0.04023,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-30T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00153,"percentile":0.04023}],"last30":[{"date":"2026-09-30T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00153,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00153,"percentile":0.04023}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-787","name":"Out-of-bounds 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6.5.1","eol":null,"hubHref":"/vendor/eclipse_foundation/eclipse-threadxnetxduo"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-2gf7-5224-5vrj","label":"github.com/eclipse-threadx/netxduo/security/advisories/GHSA-2gf7-5224-5vrj","hostname":"github.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-29T17:42:35.719Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-29T18:42:21.812Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T06:51:46.297Z","stale":false,"partial":false}}