{"id":"CVE-2026-33094","kind":"vulnerability","aliases":["CVE-2026-33094"],"related":[],"title":"Hyperscan: out-of-bounds write lets a local user crash applications","description":"Out-of-bounds write 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 unauthenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (low) and availability (high) 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 write in some code paths that runs in user-mode applications. A local unprivileged user can trigger it to cause a denial of service.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["c","hyperscan","native-libs","package"],"not_affected_if":["hyperscan-not-used","hyperscan-v5.4.2.1-or-later"],"how_to_check":"- Find where Hyperscan is used: look for `libhs` or `hyperscan` in build files and dependency manifests.\n- Check the installed Hyperscan version against the fixed version.","fix":"- Hyperscan: move to `v5.4.2.1` or later.","status":"open","published_at":"2026-11-10T18:17:36+00:00","first_seen_at":"2026-11-10T18:22:57+00:00","triaged_at":"2026-11-10T18:24:58+00:00","updated_at":"2026-11-10T18:24:58+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-10T18:24:58Z","model":"claude-haiku-5-5","output":{"fix":"- Hyperscan: move to `v5.4.2.1` or later.","reach":"local","title":"Hyperscan: out-of-bounds write lets a local user crash applications","impact":"low","summary":"Hyperscan, Intel's regular-expression matching library, has an out-of-bounds write in some code paths that runs in user-mode applications. A local unprivileged user can trigger it to cause a denial of service.","audience":"developers","category":"package","nicknames":[],"who_cares":["hyperscan","c","native-libs"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"Application crashes; denial of service on the affected host","analyst_note":"","how_to_check":"- Find where Hyperscan is used: look for `libhs` or `hyperscan` in build files and dependency manifests.\n- Check the installed Hyperscan version against the fixed version.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["hyperscan-not-used","hyperscan-v5.4.2.1-or-later"],"who_is_affected":"Applications that link Hyperscan and run on a machine where a local user can supply input or run code. The sources do not describe a network-only path, so local access is the stated trigger. Systems that do not embed Hyperscan can skip it.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000708,"input_tokens":4657,"output_tokens":485,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-33094':15A,18A '3':77C 'access':111C 'adversari':88C 'allow':81C 'applic':12A,50B,79C 'attack':98C,113C 'avail':137C,152C 'bound':5A,38B,67C 'c':19B 'caus':59B 'code':42B 'combin':93C 'complex':97C 'confidenti':132C,147C 'crash':11A 'cve':13A,16A 'denial':61B,83C,101C 'enabl':100C 'express':30B 'high':138C 'hyperscan':1A,20B,25B,71C 'impact':130C,154C 'integr':134C,149C 'intel':26B 'interact':125C 'intern':119C 'knowledg':120C 'let':7A 'lib':23B 'librari':32B 'local':9A,52B,110C 'low':96C,135C 'match':31B 'may':80C,99C,106C,129C 'mode':49B 'nativ':22B 'native-lib':21B 'none':133C,148C,150C,153C 'occur':108C 'out-of-bound':2A,35B,64C 'packag':24B 'path':43B 'potenti':107C,127C 'present':116C 'regular':29B 'regular-express':28B 'requir':114C,122C 'result':105C,143C 'ring':76C 'run':45B 'servic':63B,85C,103C 'softwar':87C 'special':118C 'subsequ':145C 'system':142C,146C 'trigger':56B 'unauthent':91C 'unprivileg':53B,86C 'user':10A,48B,54B,78C,92C,124C 'user-mod':47B 'v5.4.2.1':74C 'version':73C 'via':109C 'vulner':128C,141C 'within':75C 'without':117C 'write':6A,39B,68C","nicknames":[],"mitigations":[],"who_affected":"Applications that link Hyperscan and run on a machine where a local user can supply input or run code. The sources do not describe a network-only path, so local access is the stated trigger. Systems that do not embed Hyperscan can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["c","hyperscan","medium","nativelibs","package"],"campaign_type":null,"search_a":"'-2026':14A,17A '-33094':15A,18A 'applic':12A 'bound':5A 'crash':11A 'cve':13A,16A 'hyperscan':1A 'let':7A 'local':9A 'out-of-bound':2A 'user':10A 'write':6A","search_b":"'applic':50B 'bound':38B 'c':19B 'caus':59B 'code':42B 'denial':61B 'express':30B 'hyperscan':20B,25B 'intel':26B 'lib':23B 'librari':32B 'local':52B 'match':31B 'mode':49B 'nativ':22B 'native-lib':21B 'out-of-bound':35B 'packag':24B 'path':43B 'regular':29B 'regular-express':28B 'run':45B 'servic':63B 'trigger':56B 'unprivileg':53B 'user':48B,54B 'user-mod':47B 'write':39B","search_c":"'3':77C 'access':111C 'adversari':88C 'allow':81C 'applic':79C 'attack':98C,113C 'avail':137C,152C 'bound':67C 'combin':93C 'complex':97C 'confidenti':132C,147C 'denial':83C,101C 'enabl':100C 'high':138C 'hyperscan':71C 'impact':130C,154C 'integr':134C,149C 'interact':125C 'intern':119C 'knowledg':120C 'local':110C 'low':96C,135C 'may':80C,99C,106C,129C 'none':133C,148C,150C,153C 'occur':108C 'out-of-bound':64C 'potenti':107C,127C 'present':116C 'requir':114C,122C 'result':105C,143C 'ring':76C 'servic':85C,103C 'softwar':87C 'special':118C 'subsequ':145C 'system':142C,146C 'unauthent':91C 'unprivileg':86C 'user':78C,92C,124C 'v5.4.2.1':74C 'version':73C 'via':109C 'vulner':128C,141C 'within':75C 'without':117C 'write':68C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T18:17:36+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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":"secure@intel.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-33094","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33094","severity":null,"published_at":"2026-11-10T18:17:36+00:00","modified_at":"2026-11-10T18:17:36+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"}