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Microsoft Windows Remote Desktop Client: Out-of-bounds read information disclosure

CVE-2026-108417Medium 6.5

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Summary

The Windows Remote Desktop Client contains an out-of-bounds read (CWE-125) that allows an unauthorized attacker to read parts of memory over the network. The attacker needs no prior credentials, but the user must be lured into connecting to a malicious or attacker-controlled RDP endpoint. The impact is limited to confidentiality (CVSS 3.1: 6.5, medium).

Affected

  • Windows 10 Version 1607, 1809, 21H2, 22H2
  • Windows 11 Version 23H2, 24H2, 25H2, 26H1, 26H2
  • Windows Server 2016 and 2019 (including Server Core)
  • Microsoft Windows App Client for Windows Desktop before 2.0.1489.0
  • Exact affected build ranges: see the Microsoft Security Update Guide. Sources differ on some build numbers, so verify them before rollout.

Fixed in

  • Windows 10 1607: 10.0.14393.9688
  • Windows 10 1809 and Windows Server 2019: 10.0.17763.9487
  • Windows 10 21H2: 10.0.19044.7846
  • Windows 10 22H2: 10.0.19045.7846
  • Windows 11 23H2: 10.0.22631.7711
  • Windows 11 24H2, 25H2 and 26H2: 10.0.26100.9974 / 10.0.26200.9974 / 10.0.26300.9974
  • Windows 11 26H1: 10.0.28000.3501
  • Windows App Client for Windows Desktop: 2.0.1489.0
  • Fixes are delivered with the November 2026 Patch Tuesday updates.

Workaround

Unknown. No vendor workaround was found in the sources. Applying the update is the recommended mitigation.

Exploitation

  • No evidence of exploitation in the wild was found.
  • Rapid7 rates exploitation as unlikely and reports no public disclosure.
  • No public proof of concept was found. This is not a confirmed absence.
  • EPSS was about 0.009 in a third-party database, which indicates low predicted exploitation.
  • CISA SSVC: exploitation none, not automatable, partial technical impact.

Our recommendation

  • Include the November 2026 cumulative update in regular patching for all Windows clients, including Windows App installations.
  • Prioritise workstations that use RDP to connect to external or third-party hosts.
  • Compare the affected build list with your inventory and verify the builds against the MSRC page.
  • RDP servers exposed to the internet carry their own, separate risks that this CVE does not change.

Information from Microsoft (Patch Tuesday November 2026)

Severity (Microsoft)
Important
Impact
Information disclosure – Remote Desktop Client
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation unlikely
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, 12:37.

Original description (NVD)

Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.

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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