{"id":"CVE-2026-66282","kind":"vulnerability","aliases":["CVE-2026-66282"],"related":[],"title":"EmberZNet: malformed billing command causes endless recursion and device hang","description":"In EmberZNet 9.1.1 and earlier, a malformed Publish Billing Period command can result in a recursive function call that will never reach its end condition. These messages must come from a device that has already joined the network. Only devices supporting the Price Cluster are impacted.","summary":"EmberZNet 9.1.1 and earlier, the Silicon Labs Zigbee stack, mishandle a malformed Publish Billing Period command, which triggers a recursive call that never ends. An attacker on a joined device can likely crash or hang the affected node.","severity":"medium","cvss":6.0,"epss":0.00226,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","infrastructure","iot","silicon-labs","zigbee"],"not_affected_if":["no-zigbee-network","not-price-cluster","patched-emberznet"],"how_to_check":"- Check the EmberZNet SDK version on the device firmware: `9.1.1` or earlier is affected\n- Check whether the device supports the Zigbee Price Cluster: unknown if the sources do not list the exact device configuration","fix":"- Update EmberZNet to a release later than `9.1.1`: unknown, the fixed version is not stated in the sources","status":"open","published_at":"2026-10-22T14:17:44+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","triaged_at":"2026-10-25T04:05:26+00:00","updated_at":"2026-10-25T04:05:26+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-25T04:05:26Z","model":"claude-haiku-5-5","output":{"fix":"- Update EmberZNet to a release later than `9.1.1`: unknown, the fixed version is not stated in the sources","reach":"network","title":"EmberZNet: malformed billing command causes endless recursion and device hang","impact":"medium","summary":"EmberZNet 9.1.1 and earlier, the Silicon Labs Zigbee stack, mishandle a malformed Publish Billing Period command, which triggers a recursive call that never ends. An attacker on a joined device can likely crash or hang the affected node.","category":"infrastructure","nicknames":[],"who_cares":["zigbee","embedded","silicon-labs","iot"],"confidence":0.6,"needs_auth":"yes","worst_case":"Device enters endless recursion and stops responding","analyst_note":"Confirm the fixed EmberZNet version and the affected device list at the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-66282) or Silicon Labs advisory.","how_to_check":"- Check the EmberZNet SDK version on the device firmware: `9.1.1` or earlier is affected\n- Check whether the device supports the Zigbee Price Cluster: unknown if the sources do not list the exact device configuration","needs_analyst":true,"not_affected_if":["not-price-cluster","no-zigbee-network","patched-emberznet"],"who_is_affected":"Only Zigbee devices running EmberZNet 9.1.1 or earlier that support the Price Cluster are affected. The attacker must come from a device already joined to the Zigbee network, so isolated or non-Price-Cluster devices can skip it.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000634,"input_tokens":3348,"output_tokens":598,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-66282':13A,16A '9.1.1':25B,64C 'affect':60B 'alreadi':96C 'attack':49B 'bill':3A,37B,70C 'call':44B,79C 'caus':5A 'cluster':105C 'come':90C 'command':4A,39B,72C 'condit':86C 'crash':56B 'cve':11A,14A 'devic':9A,53B,93C,101C 'earlier':27B,66C 'embed':17B 'emberznet':1A,24B,63C 'end':47B,85C 'endless':6A 'function':78C 'hang':10A,58B 'impact':107C 'infrastructur':18B 'iot':19B 'join':52B,97C 'lab':22B,30B 'like':55B 'malform':2A,35B,68C 'messag':88C 'mishandl':33B 'must':89C 'network':99C 'never':46B,82C 'node':61B 'period':38B,71C 'price':104C 'publish':36B,69C 'reach':83C 'recurs':7A,43B,77C 'result':74C 'silicon':21B,29B 'silicon-lab':20B 'stack':32B 'support':102C 'trigger':41B 'zigbe':23B,31B","nicknames":[],"mitigations":[],"who_affected":"Only Zigbee devices running EmberZNet 9.1.1 or earlier that support the Price Cluster are affected. The attacker must come from a device already joined to the Zigbee network, so isolated or non-Price-Cluster devices can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T14:17:44+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/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","cvss_by":"product-security@silabs.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-66282","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66282","severity":null,"published_at":"2026-10-22T14:17:44+00:00","modified_at":"2026-10-23T12:18:15+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-2026-66282","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-66282","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"}