Out-of-bounds Read in Microsoft Windows 10 Version 21h2
CVE-2026-27931
Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information locally.
Vulnerability class: Buffer Overflow
EPSS: 0.001 (16.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C.
Affected products
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- Microsoft Windows 11 Version 22h3 — versions 10.0.22631.0
- Microsoft Windows 11 Version 23h2 — versions 10.0.22631.0
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
- Microsoft Windows 11 Version 26h1 — versions 10.0.28000.0
- Microsoft Windows Server 2022 — versions 10.0.20348.0
- Microsoft Windows Server 2022, 23h2 Edition (Server Core Installation) — versions 10.0.25398.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
Weakness classification (CWE)
References
- Windows GDI Information Disclosure Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-27931?
- CVE-2026-27931 is a medium-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-04-14.
- How severe is CVE-2026-27931?
- Medium severity. CVSS v3 base score is 5.5 out of 10.