{"id":"CVE-2026-101103","kind":"vulnerability","aliases":["CVE-2026-101103"],"related":[],"title":"PEAK-System PCAN diagnostic call can overflow a caller-supplied output buffer","description":"The PEAK-System PCAN diagnostic call did not validate that the caller-supplied output buffer was large enough to hold the output record.","summary":"The PEAK-System PCAN diagnostic call does not check that the caller's output buffer is large enough for the output record. Writing past the buffer can corrupt memory in the calling process.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["hardware-interface","infrastructure","pcan","peak-system"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-20T21:17:14+00:00","first_seen_at":"2026-10-23T21:57:21+00:00","triaged_at":"2026-10-25T03:44:38+00:00","updated_at":"2026-10-25T03:44:38+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-10-25T03:44:38Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"PEAK-System PCAN diagnostic call can overflow a caller-supplied output buffer","impact":"medium","summary":"The PEAK-System PCAN diagnostic call does not check that the caller's output buffer is large enough for the output record. Writing past the buffer can corrupt memory in the calling process.","category":"infrastructure","nicknames":[],"who_cares":["peak-system","pcan","hardware-interface"],"confidence":0.4,"needs_auth":"unknown","worst_case":"Memory corruption in the calling process; code execution not confirmed.","analyst_note":"Check the NVD entry and the PEAK-System advisory for affected PCAN driver or library versions, the vulnerable function name, and whether exploitation needs local access.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000504,"input_tokens":3263,"output_tokens":355,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101103':17A,20A '-2026':16A,19A 'buffer':14A,44B,55B,79C 'call':6A,35B,61B,69C 'caller':11A,41B,76C 'caller-suppli':10A,75C 'check':38B 'corrupt':57B 'cve':15A,18A 'diagnost':5A,34B,68C 'enough':47B,82C 'hardwar':22B 'hardware-interfac':21B 'hold':84C 'infrastructur':24B 'interfac':23B 'larg':46B,81C 'memori':58B 'output':13A,43B,50B,78C,86C 'overflow':8A 'past':53B 'pcan':4A,25B,33B,67C 'peak':2A,27B,31B,65C 'peak-system':1A,26B,30B,64C 'process':62B 'record':51B,87C 'suppli':12A,77C 'system':3A,28B,32B,66C 'valid':72C 'write':52B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T21:17:14+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/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":"ics-cert@hq.dhs.gov","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-101103","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101103","severity":null,"published_at":"2026-10-20T21:17:14+00:00","modified_at":"2026-10-22T17:36:46+00:00","first_seen_at":"2026-10-23T21:57:21+00:00","fetched_at":"2026-10-23T22:28:58+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"}