{"id":"CVE-2026-34489","kind":"vulnerability","aliases":["CVE-2026-34489"],"related":[],"title":"Hyperscan: untrusted pointer dereference lets local user crash the process","description":"Untrusted 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 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 untrusted pointer dereference in versions before v5.4.2.1. A local unprivileged user-space program 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","local-users","package"],"not_affected_if":["hyperscan-not-used","version-5.4.2.1-or-later"],"how_to_check":"- Check the Hyperscan version your application links against, for example with `pkg-config --modversion libhs` or the version in your build files.\n- Look for any build or vendored copy of Hyperscan older than `v5.4.2.1`.","fix":"- Hyperscan `v5.4.2.1` or later (per the sources' fixed version for this CVE).","status":"open","published_at":"2026-11-10T18:17:37+00:00","first_seen_at":"2026-11-10T18:22:57+00:00","triaged_at":"2026-11-10T18:24:58+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 `v5.4.2.1` or later (per the sources' fixed version for this CVE).","reach":"local","title":"Hyperscan: untrusted pointer dereference lets local user crash the process","impact":"low","summary":"Hyperscan, Intel's regular expression matching library, has an untrusted pointer dereference in versions before v5.4.2.1. A local unprivileged user-space program can trigger it to cause a denial of service.","audience":"developers","category":"package","nicknames":[],"who_cares":["hyperscan","c","local-users"],"confidence":0.6,"fix_status":"available","needs_auth":"yes","worst_case":"local process crashes, causing denial of service","analyst_note":"","how_to_check":"- Check the Hyperscan version your application links against, for example with `pkg-config --modversion libhs` or the version in your build files.\n- Look for any build or vendored copy of Hyperscan older than `v5.4.2.1`.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["hyperscan-not-used","version-5.4.2.1-or-later"],"who_is_affected":"Applications that embed Hyperscan and run it in user space on a machine where untrusted local code can run. The sources describe a local attack with low complexity and no user interaction. Teams that do not ship or run Hyperscan can skip it.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000726,"input_tokens":4658,"output_tokens":521,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-34489':13A,16A '3':66C 'access':100C 'adversari':77C 'allow':70C 'applic':68C 'attack':87C,102C 'avail':126C,141C 'c':17B 'caus':50B 'combin':82C 'complex':86C 'confidenti':121C,136C 'crash':8A 'cve':11A,14A 'denial':52B,72C,90C 'derefer':4A,34B,57C 'enabl':89C 'express':27B 'high':127C 'hyperscan':1A,18B,23B,60C 'impact':119C,143C 'integr':123C,138C 'intel':24B 'interact':114C 'intern':108C 'knowledg':109C 'let':5A 'librari':29B 'local':6A,20B,40B,99C 'local-us':19B 'low':85C,124C 'match':28B 'may':69C,88C,95C,118C 'none':122C,137C,139C,142C 'occur':97C 'packag':22B 'pointer':3A,33B,56C 'potenti':96C,116C 'present':105C 'process':10A 'program':45B 'regular':26B 'requir':103C,111C 'result':94C,132C 'ring':65C 'servic':54B,74C,92C 'softwar':76C 'space':44B 'special':107C 'subsequ':134C 'system':131C,135C 'trigger':47B 'unauthent':80C 'unprivileg':41B,75C 'untrust':2A,32B,55C 'user':7A,21B,43B,67C,81C,113C 'user-spac':42B 'v5.4.2.1':38B,63C 'version':36B,62C 'via':98C 'vulner':117C,130C 'within':64C 'without':106C","nicknames":[],"mitigations":[],"who_affected":"Applications that embed Hyperscan and run it in user space on a machine where untrusted local code can run. The sources describe a local attack with low complexity and no user interaction. Teams that do not ship or run Hyperscan can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["c","hyperscan","localusers","medium","package"],"campaign_type":null,"search_a":"'-2026':12A,15A '-34489':13A,16A 'crash':8A 'cve':11A,14A 'derefer':4A 'hyperscan':1A 'let':5A 'local':6A 'pointer':3A 'process':10A 'untrust':2A 'user':7A","search_b":"'c':17B 'caus':50B 'denial':52B 'derefer':34B 'express':27B 'hyperscan':18B,23B 'intel':24B 'librari':29B 'local':20B,40B 'local-us':19B 'match':28B 'packag':22B 'pointer':33B 'program':45B 'regular':26B 'servic':54B 'space':44B 'trigger':47B 'unprivileg':41B 'untrust':32B 'user':21B,43B 'user-spac':42B 'v5.4.2.1':38B 'version':36B","search_c":"'3':66C 'access':100C 'adversari':77C 'allow':70C 'applic':68C 'attack':87C,102C 'avail':126C,141C 'combin':82C 'complex':86C 'confidenti':121C,136C 'denial':72C,90C 'derefer':57C 'enabl':89C 'high':127C 'hyperscan':60C 'impact':119C,143C 'integr':123C,138C 'interact':114C 'intern':108C 'knowledg':109C 'local':99C 'low':85C,124C 'may':69C,88C,95C,118C 'none':122C,137C,139C,142C 'occur':97C 'pointer':56C 'potenti':96C,116C 'present':105C 'requir':103C,111C 'result':94C,132C 'ring':65C 'servic':74C,92C 'softwar':76C 'special':107C 'subsequ':134C 'system':131C,135C 'unauthent':80C 'unprivileg':75C 'untrust':55C 'user':67C,81C,113C 'v5.4.2.1':63C 'version':62C 'via':98C 'vulner':117C,130C 'within':64C 'without':106C","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: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-2026-34489","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34489","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"}