{"id":"CVE-2026-89409","kind":"vulnerability","aliases":["CVE-2026-89409"],"related":[],"title":"Z-Wave SDK: missing checks let joined devices remove network nodes","description":"In Z-Wave SDK 8.1.1 and earlier (for 700/800 series devices) and 6.85.02 and earlier (for 500 series devices), missing checks in the ZWAVE_CMD_NODES_EXIST handler can result in nodes being removed from the network. These messages must come from a device that has already joined the network.","summary":"Z-Wave SDK 8.1.1 and earlier (700/800 series) and 6.85.02 and earlier (500 series) fail to validate the ZWAVE_CMD_NODES_EXIST handler. A device already on the network can send messages that cause other nodes to be removed from the network.","severity":"medium","cvss":5.3,"epss":0.00269,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","infrastructure","iot","z-wave"],"not_affected_if":["devices-running-newer-sdk","no-untrusted-joined-nodes"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-22T14:17:51+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","triaged_at":"2026-10-25T04:20:19+00:00","updated_at":"2026-10-25T04:20:19+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-25T04:20:19Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Z-Wave SDK: missing checks let joined devices remove network nodes","impact":"low","summary":"Z-Wave SDK 8.1.1 and earlier (700/800 series) and 6.85.02 and earlier (500 series) fail to validate the ZWAVE_CMD_NODES_EXIST handler. A device already on the network can send messages that cause other nodes to be removed from the network.","category":"infrastructure","nicknames":[],"who_cares":["z-wave","iot","embedded"],"confidence":0.6,"needs_auth":"yes","worst_case":"Nodes are removed from the Z-Wave network, disrupting devices.","analyst_note":"Find the vendor advisory or Silicon Labs release notes listing the patched Z-Wave SDK versions for 700/800 and 500 series.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["devices-running-newer-sdk","no-untrusted-joined-nodes"],"who_is_affected":"Products built on Z-Wave SDK 8.1.1 and earlier for 700/800 series devices, or 6.85.02 and earlier for 500 series devices. The attacker must first be a device that has already joined the network, so exposure depends on who can join the mesh. Sources do not say which vendor firmware is affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00059,"input_tokens":3383,"output_tokens":504,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-89409':15A,18A '500':38B,85C '6.85.02':35B,81C '700/800':32B,77C '8.1.1':29B,73C 'alreadi':51B,115C 'caus':59B 'check':6A,89C 'cmd':45B,93C 'come':109C 'cve':13A,16A 'devic':9A,50B,79C,87C,112C 'earlier':31B,37B,75C,83C 'embed':19B 'exist':47B,95C 'fail':40B 'handler':48B,96C 'infrastructur':20B 'iot':21B 'join':8A,116C 'let':7A 'messag':57B,107C 'miss':5A,88C 'must':108C 'network':11A,54B,67B,105C,118C 'node':12A,46B,61B,94C,100C 'remov':10A,64B,102C 'result':98C 'sdk':4A,28B,72C 'send':56B 'seri':33B,39B,78C,86C 'valid':42B 'wave':3A,24B,27B,71C 'z':2A,23B,26B,70C 'z-wave':1A,22B,25B,69C 'zwave':44B,92C","nicknames":[],"mitigations":[],"who_affected":"Products built on Z-Wave SDK 8.1.1 and earlier for 700/800 series devices, or 6.85.02 and earlier for 500 series devices. The attacker must first be a device that has already joined the network, so exposure depends on who can join the mesh. Sources do not say which vendor firmware is affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T14:17:51+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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","cvss_by":"product-security@silabs.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-89409","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89409","severity":null,"published_at":"2026-10-22T14:17:51+00:00","modified_at":"2026-10-22T19:18:03+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2026-89409","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-89409","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-24T07:15:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}