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7.8

Windows DWM Core Library Discloses Local Information

CVE-2026-34336 · published 5 months ago
Summary

An authorized attacker can access sensitive information on a Windows system. This is a concern because it allows the attacker to potentially gather valuable data about the system and its users. To protect your system, apply any available updates and ensure that Windows is running the latest version.

What to do
  • Update microsoft windows_10_1607 to version 10.0.14393.9140 or later.
  • Update microsoft windows_10_1809 to version 10.0.17763.8755 or later.
  • Update microsoft windows_10_21h2 to version 10.0.19044.7291 or later.
  • Update microsoft windows_10_22h2 to version 10.0.19045.7291 or later.
  • Update microsoft windows_11_23h2 to version 10.0.22631.7079 or later.
  • Update microsoft windows_11_24h2 to version 10.0.26100.8390 or later.
  • Update microsoft windows_11_25h2 to version 10.0.26200.8390 or later.
  • Update microsoft windows_11_26h1 to version 10.0.28000.2113 or later.
  • Update microsoft windows_server_2016 to version 10.0.14393.9140 or later.
  • Update microsoft windows_server_2019 to version 10.0.17763.8755 or later.
  • Update microsoft windows_server_2022 to version 10.0.20348.5074 or later.
  • Update microsoft windows_server_2022_23h2 to version 10.0.25398.2330 or later.
  • Update microsoft windows_server_2025 to version 10.0.26100.32772 or later.
  • Update microsoft windows 10 version 1607 to version 10.0.14393.9140 or later.
  • Update microsoft windows 10 version 1809 to version 10.0.17763.8755 or later.
  • Update microsoft windows 10 version 21h2 to version 10.0.19044.7291 or later.
  • Update microsoft windows 10 version 22h2 to version 10.0.19045.7417 or later.
  • Update microsoft windows 11 version 24h2 to version 10.0.26100.8457 or later.
  • Update microsoft windows 11 version 25h2 to version 10.0.26200.8457 or later.
  • Update microsoft windows 11 version 26h1 to version 10.0.28000.2113 or later.
  • Update microsoft windows server 2016 to version 10.0.14393.9140 or later.
  • Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9140 or later.
  • Update microsoft windows server 2019 to version 10.0.17763.8755 or later.
  • Update microsoft windows server 2019 (server core installation) to version 10.0.17763.8755 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.5139 or later.
  • Update microsoft windows server 2022, 23h2 edition (server core installation) to version 10.0.25398.2330 or later.
  • Update microsoft windows server 2025 to version 10.0.26100.32860 or later.
  • Update microsoft windows server 2025 (server core installation) to version 10.0.26100.32860 or later.
Affected software
VendorProductAffected versions
microsoft windows_10_1607 < 10.0.14393.9140
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
microsoft windows_10_1809 < 10.0.17763.8755
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
microsoft windows_10_21h2 < 10.0.19044.7291
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
microsoft windows_10_22h2 < 10.0.19045.7291
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_23h2 < 10.0.22631.7079
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_24h2 < 10.0.26100.8390
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_25h2 < 10.0.26200.8390
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_26h1 < 10.0.28000.2113
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
microsoft windows_server_2016 < 10.0.14393.9140
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
microsoft windows_server_2019 < 10.0.17763.8755
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoft windows_server_2022 < 10.0.20348.5074
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoft windows_server_2022_23h2 < 10.0.25398.2330
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
microsoft windows_server_2025 < 10.0.26100.32772
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
microsoft windows 10 version 1607 < 10.0.14393.9140
microsoft windows 10 version 1809 < 10.0.17763.8755
microsoft windows 10 version 21h2 < 10.0.19044.7291
microsoft windows 10 version 22h2 < 10.0.19045.7417
microsoft windows 11 version 23h2 < 10.0.22631.7079
< 10.0.22631.7219
microsoft windows 11 version 24h2 < 10.0.26100.8457
microsoft windows 11 version 25h2 < 10.0.26200.8457
microsoft windows 11 version 26h1 < 10.0.28000.2113
microsoft windows server 2016 < 10.0.14393.9140
microsoft windows server 2016 (server core installation) < 10.0.14393.9140
microsoft windows server 2019 < 10.0.17763.8755
microsoft windows server 2019 (server core installation) < 10.0.17763.8755
microsoft windows server 2022 < 10.0.20348.5139
microsoft windows server 2022, 23h2 edition (server core installation) < 10.0.25398.2330
microsoft windows server 2025 < 10.0.26100.32860
microsoft windows server 2025 (server core installation) < 10.0.26100.32860
Original advisory text
Windows DWM Core Library Elevation of Privilege Vulnerability
Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
7.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-126Buffer Over-read
CWE-122Heap-based Buffer Overflow
Timeline
Published12 May 2026
Updated4 Nov 2026
First seen13 May 2026
Sources
CVE-2026-34336 · NVD
CVE-2026-34336 · MITRE
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