{"id":"CVE-2026-88249","kind":"vulnerability","aliases":["CVE-2026-88249"],"related":[],"title":"Windows Client for NFS: use-after-free lets a network attacker run code","description":"Use after free in Windows Client for NFS allows an unauthorized attacker to execute code over a network.","summary":"Windows Client for NFS has a use-after-free memory bug that lets an unauthorized attacker over the network execute code. The sources give a CVSS score of 8.8 and do not describe the affected versions or fix.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Client for NFS","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["infrastructure","nfs","self-hosted","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:21+00:00","triaged_at":"2026-11-10T19:25:58+00:00","updated_at":"2026-11-10T19:25:58+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:25:58Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows Client for NFS: use-after-free lets a network attacker run code","impact":"high","summary":"Windows Client for NFS has a use-after-free memory bug that lets an unauthorized attacker over the network execute code. The sources give a CVSS score of 8.8 and do not describe the affected versions or fix.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","nfs","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker runs code on the Windows machine over the network","analyst_note":"Confirm affected Windows builds, the fixed update, and whether Client for NFS must be enabled, from the Microsoft advisory for CVE-2026-88249.","how_to_check":"- unknown","plain_action":"","product_name":"Windows Client for NFS","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Machines running the Windows Client for NFS feature are the ones to look at. The sources do not state which Windows versions or configurations are affected, so unknown.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000671,"input_tokens":4480,"output_tokens":446,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Confirm affected Windows builds, the fixed update, and whether Client for NFS must be enabled, from the Microsoft advisory for CVE-2026-88249.","search":"'-2026':16A,19A '-88249':17A,20A '8.8':60B 'affect':66B 'allow':78C 'attack':12A,47B,81C 'bug':42B 'client':2A,22A,32B,75C 'code':14A,52B,84C 'cve':15A,18A 'cvss':57B 'describ':64B 'execut':51B,83C 'fix':69B 'for':23A 'free':8A,40B,72C 'give':55B 'host':29B 'infrastructur':25B 'let':9A,44B 'memori':41B 'network':11A,50B,87C 'nfs':4A,24A,26B,34B,77C 'run':13A 'score':58B 'self':28B 'self-host':27B 'sourc':54B 'unauthor':46B,80C 'use':6A,38B,70C 'use-after-fre':5A,37B 'version':67B 'window':1A,30B,31B,74C 'windows':21A","nicknames":[],"mitigations":[],"who_affected":"Machines running the Windows Client for NFS feature are the ones to look at. The sources do not state which Windows versions or configurations are affected, so unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["clientfornfs","windowsclientfornfs"],"ptokens":["client","for","nfs","windows"],"labels":["high","infrastructure","nfs","selfhosted","vendor","windows"],"campaign_type":null,"search_a":"'-2026':16A,19A '-88249':17A,20A 'attack':12A 'client':2A,22A 'code':14A 'cve':15A,18A 'for':23A 'free':8A 'let':9A 'network':11A 'nfs':4A,24A 'run':13A 'use':6A 'use-after-fre':5A 'window':1A 'windows':21A","search_b":"'8.8':60B 'affect':66B 'attack':47B 'bug':42B 'client':32B 'code':52B 'cvss':57B 'describ':64B 'execut':51B 'fix':69B 'free':40B 'give':55B 'host':29B 'infrastructur':25B 'let':44B 'memori':41B 'network':50B 'nfs':26B,34B 'score':58B 'self':28B 'self-host':27B 'sourc':54B 'unauthor':46B 'use':38B 'use-after-fre':37B 'version':67B 'window':30B,31B","search_c":"'allow':78C 'attack':81C 'client':75C 'code':84C 'execut':83C 'free':72C 'network':87C 'nfs':77C 'unauthor':80C 'use':70C 'window':74C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:34+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-88249","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88249","severity":null,"published_at":"2026-11-10T19:21:34+00:00","modified_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:21+00:00","fetched_at":"2026-11-10T19:25:21+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}