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Windows GDI: Out-of-bounds read leads to information disclosure

CVE-2026-85797High 7.5

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Summary

An out-of-bounds read in the Windows GDI graphics component allows an unauthenticated attacker to disclose information over a network. The CNA record states that no user interaction is required, but the CVSS score differs between sources (7.5 or 6.5). The impact is limited to confidentiality; integrity and availability are not affected.

Affected

  • Windows 10 Version 1607 (builds below 10.0.14393.9612)
  • Windows 10 Version 1809 (below 10.0.17763.9376)
  • Windows 10 Version 21H2 (below 10.0.19044.7807)
  • Windows 10 Version 22H2 (below 10.0.19045.7807)
  • Windows 11 Version 23H2 (below 10.0.22631.7652)
  • Windows 11 Version 24H2 (below 10.0.26100.9711)
  • Windows 11 Version 25H2 (below 10.0.26200.9711)
  • Windows 11 Version 26H1 (below 10.0.28000.3231)
  • Windows 11 Version 26H2 (below 10.0.26300.9711)
  • Windows Server 2012 (below 6.2.9200.26434)
  • Windows Server 2012 R2 (below 6.3.9600.23470)
  • Windows Server 2016 (below 10.0.14393.9612)

Note: the NVD CPE lists only Windows 10 1607; the CNA record covers the wider list above.

Fixed in

  • Windows 10 1607 and Windows Server 2016: build 10.0.14393.9612 (KB5126868, October 2026 update, per Microsoft known-issues page)
  • Other products: the fixed build is the version number listed as the upper limit in the affected list above. Verify on MSRC.

Workaround

  • No vendor-published workaround known. Install the update for your build.
  • For devices that cannot be patched, isolate them and restrict which systems can reach them. This is a recommendation, not vendor guidance.

Exploitation

  • CISA SSVC (via ADP): exploitation none, not automatable, partial technical impact.
  • EPSS about 0.91%.
  • No public proof of concept or in-the-wild reports found. KEV status not verified.

Our recommendation

  • Patch affected systems to the fixed build for their version; prioritise Windows 10 1607 and Server 2016 (build 10.0.14393.9612, KB5126868).
  • Test first on on-premises Exchange hosts: a known issue after KB5126868 affected OWA and sending email on some servers.
  • Windows 10 Enterprise LTSB 2016 reached end of updates on October 13, 2026. Plan migration to Windows 11 Enterprise LTSC 2024 or evaluate paid Extended Security Updates (ESU).
  • Verify the NVD score (7.5 versus 6.5) and KEV status, and plan against the higher score.
  • Isolate devices that cannot be patched and monitor them.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Information disclosure – Windows GDI
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5127648, KB5126651, KB5126655, KB5126657, KB5126646, KB5126653

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 2 Nov 2026, 18:35.

Original description (NVD)

Out-of-bounds read in Windows GDI 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.

Affected? We can help.

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