{"id":"CVE-2026-119834","kind":"vulnerability","aliases":["CVE-2026-119834"],"related":[],"title":"Windows Subsystem for Linux: heap overflow lets a local user gain higher privileges","description":"Heap-based buffer overflow in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.","summary":"A heap-based buffer overflow in Windows Subsystem for Linux lets an attacker who already has a local account raise their privileges. The sources do not say which WSL versions are affected or what the fixed version is.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","local-users","windows","wsl"],"not_affected_if":["wsl-not-installed"],"how_to_check":"- Run `wsl --version` in a Windows terminal to see the installed WSL version\n- Check Windows Update for pending WSL updates, since the sources do not name a fixed version","fix":null,"status":"open","published_at":"2026-11-10T19:19:59+00:00","first_seen_at":"2026-11-10T19:24:58+00:00","triaged_at":"2026-11-10T19:40:25+00:00","updated_at":"2026-11-10T19:40:25+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:40:25Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Subsystem for Linux: heap overflow lets a local user gain higher privileges","impact":"high","summary":"A heap-based buffer overflow in Windows Subsystem for Linux lets an attacker who already has a local account raise their privileges. The sources do not say which WSL versions are affected or what the fixed version is.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","wsl","local-users"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local attacker gains elevated system privileges on the Windows host","analyst_note":"Find the affected and fixed WSL versions in the Microsoft Security Response Center advisory for CVE-2026-119834; the NVD entry lists no product ranges.","how_to_check":"- Run `wsl --version` in a Windows terminal to see the installed WSL version\n- Check Windows Update for pending WSL updates, since the sources do not name a fixed version","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["wsl-not-installed"],"who_is_affected":"Machines running Windows Subsystem for Linux where users hold a local account can be targeted. The sources do not state which WSL builds are vulnerable, so the exposure window is unknown. Systems without WSL installed are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000705,"input_tokens":4500,"output_tokens":510,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected and fixed WSL versions in the Microsoft Security Response Center advisory for CVE-2026-119834; the NVD entry lists no product ranges.","search":"'-119834':16A,19A '-2026':15A,18A 'account':45B 'affect':58B 'allow':74C 'alreadi':41B 'attack':39B,77C 'author':76C 'base':29B,66C 'buffer':30B,67C 'cve':14A,17A 'elev':79C 'fix':62B 'gain':11A 'heap':5A,28B,65C 'heap-bas':27B,64C 'higher':12A 'infrastructur':20B 'let':7A,37B 'linux':4A,36B,73C 'local':9A,22B,44B,81C 'local-us':21B 'overflow':6A,31B,68C 'privileg':13A,48B,80C 'rais':46B 'say':53B 'sourc':50B 'subsystem':2A,34B,71C 'user':10A,23B 'version':56B,63B 'window':1A,24B,33B,70C 'wsl':25B,55B","nicknames":[],"mitigations":[],"who_affected":"Machines running Windows Subsystem for Linux where users hold a local account can be targeted. The sources do not state which WSL builds are vulnerable, so the exposure window is unknown. Systems without WSL installed are not affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","localusers","windows","wsl"],"campaign_type":null,"search_a":"'-119834':16A,19A '-2026':15A,18A 'cve':14A,17A 'gain':11A 'heap':5A 'higher':12A 'let':7A 'linux':4A 'local':9A 'overflow':6A 'privileg':13A 'subsystem':2A 'user':10A 'window':1A","search_b":"'account':45B 'affect':58B 'alreadi':41B 'attack':39B 'base':29B 'buffer':30B 'fix':62B 'heap':28B 'heap-bas':27B 'infrastructur':20B 'let':37B 'linux':36B 'local':22B,44B 'local-us':21B 'overflow':31B 'privileg':48B 'rais':46B 'say':53B 'sourc':50B 'subsystem':34B 'user':23B 'version':56B,63B 'window':24B,33B 'wsl':25B,55B","search_c":"'allow':74C 'attack':77C 'author':76C 'base':66C 'buffer':67C 'elev':79C 'heap':65C 'heap-bas':64C 'linux':73C 'local':81C 'overflow':68C 'privileg':80C 'subsystem':71C 'window':70C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:59+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119834","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119834","severity":null,"published_at":"2026-11-10T19:19:59+00:00","modified_at":"2026-11-10T19:19:59+00:00","first_seen_at":"2026-11-10T19:24:58+00:00","fetched_at":"2026-11-10T19:24:58+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"}