CVE-2026-81955: Windows Graphics Component Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-10-31
Weakness: CWE-122

Description

Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Affected products

Microsoft 365 Apps: from 16.0.1 before 16.0.20326.20138 — fixed in 16.0.20326.20138
Microsoft Office 365 for Mac: from 1.0.0 before 16.113.26091433 — fixed in 16.113.26091433
Microsoft Office LTSC 2021: from 16.0.1 before 16.0.14334.20906 — fixed in 16.0.14334.20906
Microsoft Office LTSC for Mac 2024: from 16.0.0 before 16.113.26091433 — fixed in 16.113.26091433
Microsoft Office: from 16.0.0 before 16.0.5569.1003 — fixed in 16.0.5569.1003
Microsoft Office LTSC 2024: from 16.0.0 before 16.0.17932.20976 — fixed in 16.0.17932.20976
Microsoft Office LTSC for Mac 2021: from 16.0.1 before 16.113.26091433 — fixed in 16.113.26091433
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.9504 — fixed in 10.0.14393.9504
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.9245 — fixed in 10.0.17763.9245
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.7725 — fixed in 10.0.19044.7725
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.7725 — fixed in 10.0.19045.7725
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.7582 — fixed in 10.0.22631.7582
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.9445 — fixed in 10.0.26100.9445
Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.9445 — fixed in 10.0.26200.9445
Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.2954 — fixed in 10.0.28000.2954
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.26349 — fixed in 6.2.9200.26349
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.23398 — fixed in 6.3.9600.23398
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.9504 — fixed in 10.0.14393.9504
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.9245 — fixed in 10.0.17763.9245
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.5622 — fixed in 10.0.20348.5622
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.33438 — fixed in 10.0.26100.33438

How to fix

Upgrade to a fixed version: Microsoft 365 Apps 16.0.20326.20138; Microsoft Office 365 for Mac 16.113.26091433; Microsoft Office LTSC 2021 16.0.14334.20906; Microsoft Office LTSC for Mac 2024 16.113.26091433; Microsoft Office 16.0.5569.1003; Microsoft Office LTSC 2024 16.0.17932.20976; Microsoft Office LTSC for Mac 2021 16.113.26091433; Microsoft Windows 10 1607 10.0.14393.9504; Microsoft Windows 10 10.0.17763.9245; Microsoft Windows 10 10.0.19044.7725; Microsoft Windows 10 10.0.19045.7725; Microsoft Windows 11 10.0.22631.7582. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81955

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