{"uuid": "9db6c0fd-5728-477f-8989-e9ea03e41b54", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-34336", "type": "seen", "source": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0141", "content": "Microsoft heeft kwetsbaarheden verholpen in Windows. Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot de volgende categorie\u00ebn schade:\n\n- Denial-of-Service (DoS)\n- Uitvoeren van willekeurige code (root/admin-rechten)\n- Uitvoeren van willekeurige code (gebruikersrechten)\n- Verkrijgen van verhoogde rechten\n- Omzeilen van een beveiligingsmaatregel\n- Toegang tot gevoelige gegevens\n\nDe ernstigste kwetsbaarheden hebben kenmerken CVE-2026-40402, CVE-2026-41089 en CVE-2026-41096 toegewezen gekregen en bevinden zich respectievelijk in Hyper-V, NETLOGON en de DNS Client. De kwetsbaarheid in Hyper-V stelt een geauthenticeerde kwaadwillende in staat om uit de Guest-VM te breken en toegang te krijgen tot geheugen van de host en mogelijk willekeurige code uit te voeren op de host. De kwetsbaarheden in NETLOGON en de DNS Client stellen een ongeauthenticeerde kwaadwillende op afstand in staat om willekeurige code uit te voeren op het kwetsbare systeem.\n\n**Met name Domain Controllers die toegankelijk zijn vanaf externe netwerken lopen een hoog risico voor actief misbruik van de kwetsbaarheid in NETLOGON.**\n\nHet verdient altijd aanbeveling om een systeem met de rol van Domain Controller niet publiek toegankelijk te hebben en, indien dit noodzakelijk is, additionele maatregelen te hebben genomen.\n\n```\nWindows Projected File System: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34340 | 7.00 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Application Identity (AppID) Subsystem: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34343 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nUndisclosed: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-41095 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Remote Desktop: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40398 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nMicrosoft Windows DNS: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-41096 | 9.80 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nWindows Ancillary Function Driver for WinSock: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34344 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34345 | 7.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-35416 | 7.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-41088 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Kernel: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-33841 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-35420 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-40369 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Secure Boot: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-41097 | 6.70 | Omzeilen van beveiligingsmaatregel  | \n|----------------|------|-------------------------------------|\n\nWindows Native WiFi Miniport Driver: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-32161 | 7.50 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nWindows Kernel-Mode Drivers: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40408 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34332 | 8.00 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nTelnet Client: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35423 | 5.40 | Toegang tot gevoelige gegevens      | \n|----------------|------|-------------------------------------|\n\nWindows Print Spooler Components: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34342 | 7.00 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows SMB Client: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40410 | 7.00 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Storage Spaces Controller: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35415 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Filtering Platform (WFP): \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-32209 | 4.40 | Omzeilen van beveiligingsmaatregel  | \n|----------------|------|-------------------------------------|\n\nWindows Volume Manager Extension Driver: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40380 | 6.20 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nWindows Cryptographic Services: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40377 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Win32K - GRFX: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-33839 | 7.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34330 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34331 | 7.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34333 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34347 | 7.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-40403 | 8.80 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nWindows Admin Center: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35438 | 8.30 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Hyper-V: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40402 | 9.30 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Rich Text Edit Control: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-32170 | 6.70 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Event Logging Service: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-33834 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Internet Key Exchange (IKE) Protocol: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35424 | 7.50 | Denial-of-Service                   | \n|----------------|------|-------------------------------------|\n\nWindows Netlogon: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-41089 | 9.80 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nWindows Storport Miniport Driver: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34350 | 6.50 | Denial-of-Service                   | \n|----------------|------|-------------------------------------|\n\nWindows Common Log File System Driver: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-40407 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-40397 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Cloud Files Mini Filter Driver: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35418 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-33835 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34337 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Win32K - ICOMP: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-33840 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-35417 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows GDI: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35421 | 7.80 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nWindows Rich Text Edit: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-21530 | 6.70 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows TCP/IP: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34351 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-35422 | 6.50 | Omzeilen van beveiligingsmaatregel  | \n| CVE-2026-40399 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-40405 | 7.50 | Denial-of-Service                   | \n| CVE-2026-40406 | 7.50 | Toegang tot gevoelige gegevens      | \n| CVE-2026-40414 | 7.40 | Denial-of-Service                   | \n| CVE-2026-40415 | 8.10 | Uitvoeren van willekeurige code     | \n| CVE-2026-33837 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34334 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-40401 | 6.20 | Denial-of-Service                   | \n| CVE-2026-40413 | 7.40 | Denial-of-Service                   | \n|----------------|------|-------------------------------------|\n\nWindows LDAP - Lightweight Directory Access Protocol: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34339 | 5.50 | Denial-of-Service                   | \n|----------------|------|-------------------------------------|\n\nWindows Telephony Service: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-42825 | 7.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34338 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-40382 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows Message Queuing: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34329 | 8.80 | Uitvoeren van willekeurige code     | \n| CVE-2026-33838 | 7.80 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\nWindows DWM Core Library: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-35419 | 5.50 | Toegang tot gevoelige gegevens      | \n| CVE-2026-42896 | 7.80 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-34336 | 7.80 | Toegang tot gevoelige gegevens      | \n|----------------|------|-------------------------------------|\n\nWindows Link-Layer Discovery Protocol (LLDP): \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-34341 | 7.00 | Verkrijgen van verhoogde rechten    | \n|----------------|------|-------------------------------------|\n\n```", "creation_timestamp": "2026-05-12T15:52:42.000000Z"}