{"id":"CVE-2026-28730","kind":"vulnerability","aliases":["CVE-2026-28730"],"related":[],"title":"Hyperscan: null pointer dereference lets a local user crash applications","description":"Null pointer dereference 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 not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (none) 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 a null pointer dereference in versions before v5.4.2.1 that an unprivileged local user can trigger. An attacker can crash the application using it, causing denial of service, but cannot read or change data.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Hyperscan","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["c","hyperscan","local-users","package"],"not_affected_if":["hyperscan-not-used","no-local-untrusted-users"],"how_to_check":"- Check the installed Hyperscan version, for example with `pkg-config --modversion libhs` or in the build files of your project\n- Look for applications that link Hyperscan and run on systems where untrusted local users have accounts","fix":"- Hyperscan: upgrade 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":"2026-11-10T18:24:37+00:00","updated_at":"2026-11-10T18:24:37+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-10T18:24:37Z","model":"claude-haiku-5-5","output":{"fix":"- Hyperscan: upgrade to `v5.4.2.1` or later","reach":"local","title":"Hyperscan: null pointer dereference lets a local user crash applications","impact":"low","summary":"Hyperscan, Intel's regular expression matching library, has a null pointer dereference in versions before v5.4.2.1 that an unprivileged local user can trigger. An attacker can crash the application using it, causing denial of service, but cannot read or change data.","audience":"developers","category":"package","nicknames":[],"who_cares":["hyperscan","c","local-users"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"local attacker crashes the application using Hyperscan","analyst_note":"","how_to_check":"- Check the installed Hyperscan version, for example with `pkg-config --modversion libhs` or in the build files of your project\n- Look for applications that link Hyperscan and run on systems where untrusted local users have accounts","plain_action":"","product_name":"Hyperscan","needs_analyst":false,"not_affected_if":["hyperscan-not-used","no-local-untrusted-users"],"who_is_affected":"Applications that embed Hyperscan and run it on a machine where unprivileged local users can submit input to them. Network-only services that never let untrusted local users run code near the library are less exposed. Teams using a packaged distribution should check whether their vendor has shipped the fixed version.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000737,"input_tokens":4654,"output_tokens":543,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-28730':13A,16A '3':76C 'access':110C 'adversari':87C 'allow':80C 'applic':10A,52B,78C 'attack':48B,97C,112C 'avail':137C,152C 'c':18B 'cannot':60B 'caus':55B 'chang':63B 'combin':92C 'complex':96C 'confidenti':132C,147C 'crash':9A,50B 'cve':11A,14A 'data':64B 'denial':56B,82C,100C 'derefer':4A,35B,67C 'enabl':99C 'express':28B 'high':138C 'hyperscan':1A,17A,19B,24B,70C 'impact':130C,154C 'integr':134C,149C 'intel':25B 'interact':125C 'intern':119C 'knowledg':120C 'let':5A 'librari':30B 'local':7A,21B,43B,109C 'local-us':20B 'low':95C 'match':29B 'may':79C,98C,105C,129C 'none':133C,135C,148C,150C,153C 'null':2A,33B,65C 'occur':107C 'packag':23B 'pointer':3A,34B,66C 'potenti':106C,127C 'present':116C 'read':61B 'regular':27B 'requir':113C,122C 'result':104C,143C 'ring':75C 'servic':58B,84C,102C 'softwar':86C 'special':118C 'subsequ':145C 'system':142C,146C 'trigger':46B 'unauthent':90C 'unprivileg':42B,85C 'use':53B 'user':8A,22B,44B,77C,91C,124C 'v5.4.2.1':39B,73C 'version':37B,72C 'via':108C 'vulner':128C,141C 'within':74C 'without':117C","nicknames":[],"mitigations":[],"who_affected":"Applications that embed Hyperscan and run it on a machine where unprivileged local users can submit input to them. Network-only services that never let untrusted local users run code near the library are less exposed. Teams using a packaged distribution should check whether their vendor has shipped the fixed version.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":["hyperscan"],"ptokens":["hyperscan"],"labels":["c","hyperscan","localusers","medium","package","vendor"],"campaign_type":null,"search_a":"'-2026':12A,15A '-28730':13A,16A 'applic':10A 'crash':9A 'cve':11A,14A 'derefer':4A 'hyperscan':1A,17A 'let':5A 'local':7A 'null':2A 'pointer':3A 'user':8A","search_b":"'applic':52B 'attack':48B 'c':18B 'cannot':60B 'caus':55B 'chang':63B 'crash':50B 'data':64B 'denial':56B 'derefer':35B 'express':28B 'hyperscan':19B,24B 'intel':25B 'librari':30B 'local':21B,43B 'local-us':20B 'match':29B 'null':33B 'packag':23B 'pointer':34B 'read':61B 'regular':27B 'servic':58B 'trigger':46B 'unprivileg':42B 'use':53B 'user':22B,44B 'v5.4.2.1':39B 'version':37B","search_c":"'3':76C 'access':110C 'adversari':87C 'allow':80C 'applic':78C 'attack':97C,112C 'avail':137C,152C 'combin':92C 'complex':96C 'confidenti':132C,147C 'denial':82C,100C 'derefer':67C 'enabl':99C 'high':138C 'hyperscan':70C 'impact':130C,154C 'integr':134C,149C 'interact':125C 'intern':119C 'knowledg':120C 'local':109C 'low':95C 'may':79C,98C,105C,129C 'none':133C,135C,148C,150C,153C 'null':65C 'occur':107C 'pointer':66C 'potenti':106C,127C 'present':116C 'requir':113C,122C 'result':104C,143C 'ring':75C 'servic':84C,102C 'softwar':86C 'special':118C 'subsequ':145C 'system':142C,146C 'unauthent':90C '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":"2026-11-10T18:17:36+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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":"secure@intel.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-28730","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28730","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"}