{"id":"CVE-2026-67374","kind":"vulnerability","aliases":["CVE-2026-67374"],"related":[],"title":"Microsoft SQL Server: heap overflow lets an authorized user run code","description":"Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.","summary":"A heap-based buffer overflow in Microsoft SQL Server lets a user who already has authorized access send crafted input over the network. A successful attack can run code on the database server.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["runtime","self-hosted","sql-server","windows"],"not_affected_if":["no-network-access","no-untrusted-accounts"],"how_to_check":"- Identify SQL Server instances and their build with `SELECT @@VERSION;`\n- Compare the build against the patched builds listed in Microsoft's advisory for CVE-2026-67374 (unknown in these sources)","fix":null,"status":"open","published_at":"2026-11-10T19:21:17+00:00","first_seen_at":"2026-11-10T19:25:16+00:00","triaged_at":"2026-11-10T19:26:11+00:00","updated_at":"2026-11-10T19:26:11+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-10T19:26:11Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft SQL Server: heap overflow lets an authorized user run code","impact":"high","summary":"A heap-based buffer overflow in Microsoft SQL Server lets a user who already has authorized access send crafted input over the network. A successful attack can run code on the database server.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["sql-server","windows","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker runs code on the SQL Server host over the network","analyst_note":"Find the affected and patched SQL Server builds in Microsoft's security update guide entry for CVE-2026-67374 (https://nvd.nist.gov/vuln/detail/CVE-2026-67374 links to it).","how_to_check":"- Identify SQL Server instances and their build with `SELECT @@VERSION;`\n- Compare the build against the patched builds listed in Microsoft's advisory for CVE-2026-67374 (unknown in these sources)","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-network-access","no-untrusted-accounts"],"who_is_affected":"Organizations running Microsoft SQL Server that allow network access to it by authorized accounts. The sources do not list affected builds or required non-default configuration, so exposure cannot be confirmed from them. Servers reachable only from trusted local systems with no untrusted accounts carry lower risk.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000727,"input_tokens":4482,"output_tokens":557,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected and patched SQL Server builds in Microsoft's security update guide entry for CVE-2026-67374 (https://nvd.nist.gov/vuln/detail/CVE-2026-67374 links to it).","search":"'-2026':13A,16A '-67374':14A,17A 'access':43B 'allow':68C 'alreadi':40B 'attack':52B,71C 'author':8A,42B,70C 'base':29B,62C 'buffer':30B,63C 'code':11A,55B,74C 'craft':45B 'cve':12A,15A 'databas':58B 'execut':73C 'heap':4A,28B,61C 'heap-bas':27B,60C 'host':21B 'input':46B 'let':6A,36B 'microsoft':1A,33B 'network':49B,77C 'overflow':5A,31B,64C 'run':10A,54B 'runtim':18B 'self':20B 'self-host':19B 'send':44B 'server':3A,24B,35B,59B,67C 'sql':2A,23B,34B,66C 'sql-server':22B 'success':51B 'user':9A,38B 'window':25B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft SQL Server that allow network access to it by authorized accounts. The sources do not list affected builds or required non-default configuration, so exposure cannot be confirmed from them. Servers reachable only from trusted local systems with no untrusted accounts carry lower risk.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","runtime","selfhosted","sqlserver","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-67374':14A,17A 'author':8A 'code':11A 'cve':12A,15A 'heap':4A 'let':6A 'microsoft':1A 'overflow':5A 'run':10A 'server':3A 'sql':2A 'user':9A","search_b":"'access':43B 'alreadi':40B 'attack':52B 'author':42B 'base':29B 'buffer':30B 'code':55B 'craft':45B 'databas':58B 'heap':28B 'heap-bas':27B 'host':21B 'input':46B 'let':36B 'microsoft':33B 'network':49B 'overflow':31B 'run':54B 'runtim':18B 'self':20B 'self-host':19B 'send':44B 'server':24B,35B,59B 'sql':23B,34B 'sql-server':22B 'success':51B 'user':38B 'window':25B","search_c":"'allow':68C 'attack':71C 'author':70C 'base':62C 'buffer':63C 'code':74C 'execut':73C 'heap':61C 'heap-bas':60C 'network':77C 'overflow':64C 'server':67C 'sql':66C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:17+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/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-2026-67374","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67374","severity":null,"published_at":"2026-11-10T19:21:17+00:00","modified_at":"2026-11-10T19:21:17+00:00","first_seen_at":"2026-11-10T19:25:16+00:00","fetched_at":"2026-11-10T19:25:16+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"}