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Windows Distributed Transaction Coordinator: Local privilege escalation via heap overflow

CVE-2026-119917High 7.8

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Summary

A heap-based buffer overflow in the Windows Distributed Transaction Coordinator (MSDTC) allows an authorized local user to elevate privileges. Successful exploitation would give the attacker a total loss of confidentiality, integrity and availability on the affected system. An attacker needs a local foothold and a low-privileged account, so this is a follow-on step after another compromise, such as phishing or a stolen credential.

Affected

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

Fixed in

  • Install the Microsoft security update from November 2026 (Patch Tuesday) or later.
  • Fixed builds: 10.0.14393.9688, 10.0.17763.9487, 10.0.19044.7846, 10.0.19045.7846, 10.0.22631.7711, 10.0.26100.9974, 10.0.26200.9974, 10.0.28000.3501, 10.0.26300.9974, 10.0.20348.5870.
  • The specific KB number for this CVE is unknown. Verify it in the MSRC Security Update Guide.

Workaround

  • No vendor workaround found. Status: unknown.
  • Where MSDTC is not needed, stop and disable the MSDTC service. Confirm first that no dependent application relies on it.

Exploitation

  • Exploited in the wild: unknown, no evidence found in the available sources.
  • Public proof of concept: none found.
  • CISA SSVC: exploitation none, not automatable, technical impact total.
  • NVD status at time of analysis: Awaiting Analysis.

Our recommendation

  • Apply the November 2026 cumulative update to all affected Windows 10, 11 and Server systems, then verify the build number against the MSRC table.
  • Identify hosts where the MSDTC service is running (for example with Get-Service MSDTC) and prioritise servers that run transactional database, legacy COM/.NET or multi-user applications.
  • Disable MSDTC on systems where no dependent application needs it.
  • Review local accounts and privileged logons on affected servers.
  • Monitor MSRC and NVD for updates on exploitation status.

Information from Microsoft (Patch Tuesday November 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows Distributed Transaction Coordinator
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061

Entry in the Microsoft Security Update Guide

Public exploits

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

Research sources

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, 03:41.

Original description (NVD)

Heap-based buffer overflow in Windows Distributed Transaction Coordinator allows an authorized attacker to elevate privileges locally.

NVD references (1)

Sources

The tracker combines official, freely usable data sources – updated continuously:

This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.

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