Windows Remote Desktop Client: Information disclosure through out-of-bounds read
Summary
The Windows Remote Desktop Client contains an out-of-bounds read flaw (CWE-125) that can be triggered over the network. An unauthenticated attacker may be able to read parts of memory and disclose information, but user interaction is required. Integrity and availability are not affected. Microsoft rates the flaw Important, and no exploitation has been observed.
Affected
- Windows 10 Version 1607 and Windows Server 2016 (including Server Core): before 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019 (including Server Core): 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
- Microsoft Windows App Client for Windows Desktop: before 2.0.1489.0
Fixed in
- Install the November 2026 security updates for the affected Windows builds listed above (released 10 Nov 2026).
- Update the Windows App Client for Windows Desktop to version 2.0.1489.0 or later.
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild.
- Rapid7 rates exploitation as less likely; Microsoft's exploit code maturity is rated Unproven.
- CISA SSVC: exploitation none, not automatable, partial technical impact.
- No public proof of concept found.
Our recommendation
- Deploy the November 2026 Windows updates through Windows Update, WSUS or Intune, prioritising Windows 10 systems that are still supported or enrolled in ESU.
- Check for Windows 10 1607 and 1809 systems, which may no longer receive standard support, and replace or upgrade them.
- Patch the other RDP client information disclosure CVEs from the same Patch Tuesday together with this one.
- Instruct staff not to connect the RDP client to untrusted or unknown endpoints until systems are patched.
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 less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-108419 msrc.microsoft.com
- CVE.org CNA record: CVE-2026-108419 www.cve.org
- Rapid7: November 2026 Patch Tuesday www.rapid7.com
- OffSeq threat radar: CVE-2026-108419 radar.offseq.com
- Strix: CVE-2026-108419 www.strix.ai
- EUVD / Vulners: EUVD-2026-99475 vulners.com
- CyberPress: Microsoft November 2026 patches cyberpress.org
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, 12:36.
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:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
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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