{"id":"CVE-2026-40216","kind":"vulnerability","aliases":["CVE-2026-40216"],"related":[],"title":"Hyperscan: out-of-bounds read lets a local user crash applications","description":"Out-of-bounds read for some Hyperscan before version v5.4.2.1 within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (none) and availability (low) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.","summary":"Hyperscan, Intel's regular expression matching library, has an out-of-bounds read in versions before v5.4.2.1 when run in user space. A local user with an account can trigger it to cause a denial of service.","severity":"medium","cvss":4.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["hyperscan","intel","local-users","package"],"not_affected_if":["hyperscan-v5.4.2.1-or-later","no-local-untrusted-users"],"how_to_check":"- Check the Hyperscan version your applications link against, for example by looking at the package manifest or the installed library version.","fix":"- Move to Hyperscan `v5.4.2.1` or later.","status":"open","published_at":"2026-11-10T18:17:37+00:00","first_seen_at":"2026-11-10T18:22:57+00:00","triaged_at":"2026-11-10T18:26:27+00:00","updated_at":"2026-11-10T18:26:27+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-10T18:26:27Z","model":"claude-haiku-5-5","output":{"fix":"- Move to Hyperscan `v5.4.2.1` or later.","reach":"local","title":"Hyperscan: out-of-bounds read lets a local user crash applications","impact":"low","summary":"Hyperscan, Intel's regular expression matching library, has an out-of-bounds read in versions before v5.4.2.1 when run in user space. A local user with an account can trigger it to cause a denial of service.","audience":"developers","category":"package","nicknames":[],"who_cares":["hyperscan","intel","local-users"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"Local user crashes a process using Hyperscan, causing denial of service.","analyst_note":"","how_to_check":"- Check the Hyperscan version your applications link against, for example by looking at the package manifest or the installed library version.\n- unknown for other checks; the sources do not say.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["no-local-untrusted-users","hyperscan-v5.4.2.1-or-later"],"who_is_affected":"Applications that embed Hyperscan in user space and run it on machines where untrusted local users have accounts are the ones exposed. The sources do not describe a network-facing trigger, and systems without local untrusted users are less exposed.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000716,"input_tokens":4657,"output_tokens":501,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-40216':15A,18A '3':76C 'access':110C 'account':53B 'adversari':87C 'allow':80C 'applic':12A,78C 'attack':97C,112C 'authent':90C 'avail':137C,152C 'bound':5A,37B,66C 'caus':58B 'combin':92C 'complex':96C 'confidenti':132C,147C 'crash':11A 'cve':13A,16A 'denial':60B,82C,100C 'enabl':99C 'express':29B 'hyperscan':1A,19B,25B,70C 'impact':130C,154C 'integr':134C,149C 'intel':20B,26B 'interact':125C 'intern':119C 'knowledg':120C 'let':7A 'librari':31B 'local':9A,22B,49B,109C 'local-us':21B 'low':95C,133C,138C 'match':30B 'may':79C,98C,105C,129C 'none':135C,148C,150C,153C 'occur':107C 'out-of-bound':2A,34B,63C 'packag':24B 'potenti':106C,127C 'present':116C 'read':6A,38B,67C 'regular':28B 'requir':113C,122C 'result':104C,143C 'ring':75C 'run':44B 'servic':62B,84C,102C 'softwar':86C 'space':47B 'special':118C 'subsequ':145C 'system':142C,146C 'trigger':55B 'unprivileg':85C 'user':10A,23B,46B,50B,77C,91C,124C 'v5.4.2.1':42B,73C 'version':40B,72C 'via':108C 'vulner':128C,141C 'within':74C 'without':117C","nicknames":[],"mitigations":[],"who_affected":"Applications that embed Hyperscan in user space and run it on machines where untrusted local users have accounts are the ones exposed. The sources do not describe a network-facing trigger, and systems without local untrusted users are less exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["hyperscan","intel","localusers","medium","package"],"campaign_type":null,"search_a":"'-2026':14A,17A '-40216':15A,18A 'applic':12A 'bound':5A 'crash':11A 'cve':13A,16A 'hyperscan':1A 'let':7A 'local':9A 'out-of-bound':2A 'read':6A 'user':10A","search_b":"'account':53B 'bound':37B 'caus':58B 'denial':60B 'express':29B 'hyperscan':19B,25B 'intel':20B,26B 'librari':31B 'local':22B,49B 'local-us':21B 'match':30B 'out-of-bound':34B 'packag':24B 'read':38B 'regular':28B 'run':44B 'servic':62B 'space':47B 'trigger':55B 'user':23B,46B,50B 'v5.4.2.1':42B 'version':40B","search_c":"'3':76C 'access':110C 'adversari':87C 'allow':80C 'applic':78C 'attack':97C,112C 'authent':90C 'avail':137C,152C 'bound':66C 'combin':92C 'complex':96C 'confidenti':132C,147C 'denial':82C,100C 'enabl':99C 'hyperscan':70C 'impact':130C,154C 'integr':134C,149C 'interact':125C 'intern':119C 'knowledg':120C 'local':109C 'low':95C,133C,138C 'may':79C,98C,105C,129C 'none':135C,148C,150C,153C 'occur':107C 'out-of-bound':63C 'potenti':106C,127C 'present':116C 'read':67C 'requir':113C,122C 'result':104C,143C 'ring':75C 'servic':84C,102C 'softwar':86C 'special':118C 'subsequ':145C 'system':142C,146C 'unprivileg':85C 'user':77C,91C,124C 'v5.4.2.1':73C 'version':72C 'via':108C 'vulner':128C,141C 'within':74C 'without':117C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T18:17:37+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/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":"secure@intel.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-40216","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40216","severity":null,"published_at":"2026-11-10T18:17:37+00:00","modified_at":"2026-11-10T18:17:37+00:00","first_seen_at":"2026-11-10T18:22:57+00:00","fetched_at":"2026-11-10T18:22:57+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"}