Windows TPM: Heap-based buffer overflow enables local privilege escalation

Summary

A heap-based buffer overflow in the Windows Trusted Platform Module (TPM) component allows an authorized local attacker to elevate privileges. The attacker needs local code execution or a logon with a low-privileged account first, so the flaw is not directly reachable from the internet. Successful exploitation could lead to full loss of confidentiality, integrity and availability on the affected host.

Affected

• Windows 10 Version 1607 and Windows Server 2016 (including Server Core), builds before 10.0.14393.9688
• Windows 10 Version 1809 and Windows Server 2019 (including Server Core), builds before 10.0.17763.9487
• Windows 10 Version 21H2, builds before 10.0.19044.7846
• Windows 10 Version 22H2, builds before 10.0.19045.7846
• Windows 11 Version 23H2, builds before 10.0.22631.7711
• Windows 11 Version 24H2, builds before 10.0.26100.9974
• Windows 11 Version 25H2, builds before 10.0.26200.9974
• Windows 11 Version 26H1, builds before 10.0.28000.3501
• Windows 11 Version 26H2, builds before 10.0.26300.9974
• Windows Server 2022, builds before 10.0.20348.5870

Fixed in

• Fixed in the Microsoft November 2026 security update for the builds listed above (build numbers as stated in the official CVE record)
• Specific KB article numbers: Unknown. Check the MSRC page for each product.

Workaround

Unknown. No vendor-recommended interim mitigation was found. Apply the security update.

Exploitation

• Microsoft marks this CVE as not exploited.
• CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
• No public proof-of-concept found in our searches; this does not prove that none exists.

Our recommendation

• Install the Microsoft November 2026 security update on all affected systems, prioritizing administrative workstations, shared PCs and servers.
• Verify installed builds against the MSRC page before and after rollout.
• Identify systems that cannot be patched promptly, such as end-of-support Windows 10 1607 or 1809 builds, and check their support status with Microsoft.
• Monitor for a public proof-of-concept and for updates to the NVD entry.
• Limit local logon rights and enforce least privilege to reduce the attack path.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• MSRC Security Update Guide: CVE-2026-119382 msrc.microsoft.com
• Zero Day Initiative: November 2026 Security Update Review www.zerodayinitiative.com
• Qualys: Microsoft Patch Tuesday November 2026 Review blog.qualys.com
• Cisco Talos: Microsoft Patch Tuesday for November 2026 blog.talosintelligence.com

Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 03:55.