ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-85908

Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

Published Oct 13, 2026 · catalog updated Oct 31, 2026 · Microsoft Microsoft 365

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-85908. EPSS is 0.42%. Act only if a listed version of Microsoft Microsoft 365 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.42%
Remediation
Version ranges on file
Affected products
cpe microsoft/windows 10 1607 · cpe microsoft/windows 10 1809 · cpe microsoft/windows 10 21h2 · cpe microsoft/windows 10 22h2 · microsoft Microsoft Office 365 for Mac · microsoft Microsoft Office LTSC for Mac 2021

Affected Microsoft products: Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office for Android.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows 10 1607< 10.0.14393.9612
  • cpe microsoft/windows 10 1809< 10.0.17763.9376
  • cpe microsoft/windows 10 21h2< 10.0.19044.7807
  • cpe microsoft/windows 10 22h2< 10.0.19045.7807
  • microsoft Microsoft Office 365 for Macversion unspecified
  • microsoft Microsoft Office LTSC for Mac 2021version unspecified
  • microsoft Microsoft Office LTSC for Mac 2024version unspecified
  • microsoft Microsoft Office for Androidversion unspecified

How to fix CVE-2026-85908

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-85908. EPSS is 0.42%. Act only if a listed version of Microsoft Microsoft 365 is installed.

Which versions are affected?

Compare what you have installed with microsoft/windows 10 1607 < 10.0.14393.9612; microsoft/windows 10 1809 < 10.0.17763.9376; microsoft/windows 10 21h2 < 10.0.19044.7807; microsoft/windows 10 22h2 < 10.0.19045.7807. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow; CWE-190: Integer Overflow. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

    Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

  2. Oct 31, 2026 · NIST NVD

    Updated

    Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

Sources

  • CVE.orgVulnerability recordCVE-2026-85908

    Official CVE identifier

    cve.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-85908

    Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office for Android

    msrc.microsoft.com
  • NIST NVDVulnerability recordCVE-2026-85908

    Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

    nvd.nist.gov
  • Tenable CVE DatabaseVulnerability recordCVE-2026-85908

    Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

    tenable.com

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Microsoft Security Update GuideNov 6, 2026
  • CVE.orgNov 2, 2026
  • Tenable CVE DatabaseNov 1, 2026
  • NIST NVDNov 1, 2026