{"id":"CVE-2026-82947","kind":"vulnerability","aliases":["CVE-2026-82947"],"related":[],"title":"SOEM: frame processing trusts device lengths, reads past buffers","description":"SOEM version 2.0.0 and earlier contains multiple vulnerabilities in frame processing where a malicious device can cause the master to read data outside allocated buffers. The software uses length and offset values from device messages without validating them against buffer sizes. This can cause the master to access invalid memory locations, potentially disclosing sensitive information or causing crashes.","summary":"SOEM, an EtherCAT master library, uses length and offset values from device frames without checking them against buffer sizes. A malicious EtherCAT device can make the master read outside its buffers, leaking memory contents or crashing the process.","severity":"high","cvss":7.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","ethercat","industrial-control","other","robotics","soem"],"not_affected_if":["no-untrusted-devices-on-bus"],"how_to_check":"- Check the installed SOEM version; the sources say versions `2.0.0` and earlier are affected.\n- unknown for other checks; the sources do not describe a specific setting or file to inspect.","fix":"- Move to a SOEM release newer than `2.0.0`; the sources do not name the fixed version.\n- unknown for other actions; the sources do not give a mitigation.","status":"open","published_at":"2026-10-26T09:16:36+00:00","first_seen_at":"2026-10-26T09:29:16+00:00","triaged_at":"2026-10-26T09:30:52+00:00","updated_at":"2026-10-26T09:30:52+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-26T09:30:52Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a SOEM release newer than `2.0.0`; the sources do not name the fixed version.\n- unknown for other actions; the sources do not give a mitigation.","reach":"network","title":"SOEM: frame processing trusts device lengths, reads past buffers","impact":"medium","summary":"SOEM, an EtherCAT master library, uses length and offset values from device frames without checking them against buffer sizes. A malicious EtherCAT device can make the master read outside its buffers, leaking memory contents or crashing the process.","category":"other","nicknames":[],"who_cares":["soem","ethercat","industrial-control","robotics","embedded"],"confidence":0.6,"needs_auth":"no","worst_case":"Master reads out-of-bounds memory, leaking data or crashing the process","analyst_note":"Find the fixed SOEM version and any advisory text at the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-82947) or the SOEM upstream repository.","how_to_check":"- Check the installed SOEM version; the sources say versions `2.0.0` and earlier are affected.\n- unknown for other checks; the sources do not describe a specific setting or file to inspect.","needs_analyst":true,"not_affected_if":["no-untrusted-devices-on-bus"],"who_is_affected":"Teams running SOEM as an EtherCAT master on industrial or robotics controllers, where the master talks to attached field devices. The exposure requires a malicious or compromised device on the EtherCAT bus, so systems with no untrusted devices on that network are less exposed. The sources do not say which applications embed SOEM.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000635,"input_tokens":3336,"output_tokens":603,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':11A,14A '-82947':12A,15A '2.0.0':64C 'access':109C 'alloc':85C 'buffer':9A,41B,54B,86C,101C 'caus':78C,105C,118C 'check':38B 'contain':67C 'content':57B 'control':20B 'crash':59B,119C 'cve':10A,13A 'data':83C 'devic':5A,35B,46B,76C,95C 'disclos':114C 'earlier':66C 'embed':16B 'ethercat':17B,26B,45B 'frame':2A,36B,71C 'industri':19B 'industrial-control':18B 'inform':116C 'invalid':110C 'leak':55B 'length':6A,30B,90C 'librari':28B 'locat':112C 'make':48B 'malici':44B,75C 'master':27B,50B,80C,107C 'memori':56B,111C 'messag':96C 'multipl':68C 'offset':32B,92C 'outsid':52B,84C 'past':8A 'potenti':113C 'process':3A,61B,72C 'read':7A,51B,82C 'robot':22B 'sensit':115C 'size':42B,102C 'soem':1A,23B,24B,62C 'softwar':88C 'trust':4A 'use':29B,89C 'valid':98C 'valu':33B,93C 'version':63C 'vulner':69C 'without':37B,97C","nicknames":[],"mitigations":[],"who_affected":"Teams running SOEM as an EtherCAT master on industrial or robotics controllers, where the master talks to attached field devices. The exposure requires a malicious or compromised device on the EtherCAT bus, so systems with no untrusted devices on that network are less exposed. The sources do not say which applications embed SOEM.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T09:16:36+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","cvss_by":"a6d3dc9e-0591-4a13-bce7-0f5b31ff6158","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-82947","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82947","severity":null,"published_at":"2026-10-26T09:16:36+00:00","modified_at":"2026-10-26T09:16:36+00:00","first_seen_at":"2026-10-26T09:29:16+00:00","fetched_at":"2026-10-26T09:29:16+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"}