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Microsoft Windows: Local privilege escalation via heap overflow in Resume

CVE-2026-96318High 7.8

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Summary

A heap-based buffer overflow in the Windows Resume component allows an authorized local attacker to elevate privileges. The attacker needs an existing local account with low privileges, so the flaw is not directly reachable from the internet. Microsoft rates the impact as high for confidentiality, integrity and availability (CVSS 3.1: 7.8).

Affected

  • Windows 10 Version 1607 (10.0.14393.0 to below 10.0.14393.9612)
  • Windows 10 Version 1809 (10.0.17763.0 to below 10.0.17763.9376)
  • Windows 10 Version 21H2 (10.0.19044.0 to below 10.0.19044.7807)
  • Windows 10 Version 22H2 (10.0.19045.0 to below 10.0.19045.7807)
  • Windows 11 Version 23H2 (10.0.22631.0 to below 10.0.22631.7652)
  • Windows 11 Version 24H2 (10.0.26100.0 to below 10.0.26100.9711)
  • Windows 11 Version 25H2 (10.0.26200.0 to below 10.0.26200.9711)
  • Windows 11 Version 26H1 (10.0.28000.0 to below 10.0.28000.3231)
  • Windows 11 Version 26H2 (10.0.26300.0 to below 10.0.26300.9711)
  • Windows Server 2012 incl. Server Core (6.2.9200.0 to below 6.2.9200.26434)
  • Windows Server 2012 R2 incl. Server Core (6.3.9600.0 to below 6.3.9600.23470)
  • Windows Server 2016 (10.0.14393.0 to below 10.0.14393.9612)

Fixed in

  • Per the CVE record, the fixed builds are the versions listed as the upper bounds above, for example 10.0.14393.9612 for Windows 10 1607 and Windows Server 2016.
  • KB article numbers: Unknown. Confirm in the Microsoft Security Update Guide.

Workaround

  • Unknown. No interim mitigation from Microsoft was found.

Exploitation

  • No evidence of exploitation in the wild found. CISA SSVC: exploitation none, not automatable, total technical impact.
  • No public proof of concept found.
  • Not listed in the CISA KEV catalog as far as found.

Our recommendation

  • Install the Microsoft security update for each affected Windows version as soon as possible.
  • Check whether any Windows 10 1607 or Windows Server 2012 systems are still in use and whether Microsoft still provides updates for them; if not, plan an upgrade or isolation.
  • Limit local logons on shared workstations and terminal servers and review local accounts.
  • Monitor for unexpected privilege changes and new local administrator accounts.
  • Priority: medium for typical fleets; higher for unsupported systems, shared machines and multi-user servers.

Information from Microsoft (Patch Tuesday October 2026)

Severity (Microsoft)
Important
Impact
Elevation of privilege – Windows Resume
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows, Windows ESU (Extended Security Updates)
Updates (KB)
KB5126835, KB5126836, KB5126868, KB5126651, KB5126657, KB5126655

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, 00:53.

Original description (NVD)

Heap-based buffer overflow in Windows Resume 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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