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High severity7.0NVD Advisory· Published Feb 10, 2026· Updated Jun 17, 2026

CVE-2026-21253

CVE-2026-21253

Description

Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.

Affected products

45
  • Microsoft/Windows Server 2012 (Server Core installation)v5
    Range: 6.2.9200.0
  • Microsoft/Windows 10 version 1607cpe-rescue
    Range: 10.0.22631.0
  • Microsoft/Windows Server 2012 R2 (Server Core installation)v5
    Range: 6.3.9600.0
  • Microsoft/Windows Server 2016 (Server Core installation)v5
    Range: 10.0.14393.0
  • Microsoft/Windows Server 2019 (Server Core installation)v5
    Range: 10.0.17763.0
  • Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5
    Range: 10.0.25398.0
  • Microsoft/Windows Server 2025 (Server Core installation)v5
    Range: 10.0.26100.0
  • Microsoft/Mailslot File Systemllm-create
  • Microsoft/Windows 10 1607cpe-rescue11 versions
    10.0.14393.0+ 10 more
    • (no CPE)range: 10.0.14393.0
    • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*range: <10.0.14393.8868
    • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*range: <10.0.14393.8868
    • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*range: <10.0.19044.6937
    • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*range: <10.0.19044.6937
    • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*range: <10.0.19044.6937
    • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*range: <10.0.19045.6937
    • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*range: <10.0.19045.6937
    • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*range: <10.0.19045.6937
    • (no CPE)range: 10.0.19044.0
    • (no CPE)range: 10.0.19045.0
  • Microsoft/Windows 10 1809cpe-rescue3 versions
    10.0.17763.0+ 2 more
    • (no CPE)range: 10.0.17763.0
    • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*range: <10.0.17763.8389
    • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*range: <10.0.17763.8389
  • Microsoft/Windows 11 23h2cpe-rescue3 versions
    10.0.22631.0+ 2 more
    • (no CPE)range: 10.0.22631.0
    • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*range: <10.0.22631.6649
    • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*range: <10.0.22631.6649
  • Microsoft/Windows 11 24h2cpe-rescue3 versions
    10.0.26100.0+ 2 more
    • (no CPE)range: 10.0.26100.0
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*range: <10.0.26100.7781
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*range: <10.0.26100.7781
  • Microsoft/Windows 11 25h2cpe-rescue3 versions
    10.0.26200.0+ 2 more
    • (no CPE)range: 10.0.26200.0
    • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*range: <10.0.26200.7781
    • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*range: <10.0.26200.7781
  • Microsoft/Windows 11 26h1cpe-rescue
    Range: 10.0.28000.0
  • Microsoft/Windows Server 2012cpe-rescue5 versions
    6.2.9200.0+ 4 more
    • (no CPE)range: 6.2.9200.0
    • (no CPE)range: 6.3.9600.0
    • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:-:*:x64:*range: <10.0.25398.2149
  • Microsoft/Windows Server 2016cpe-rescue2 versions
    10.0.14393.0+ 1 more
    • (no CPE)range: 10.0.14393.0
    • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:-:*:x64:*range: <10.0.14393.8868
  • Microsoft/Windows Server 2019cpe-rescue2 versions
    10.0.17763.0+ 1 more
    • (no CPE)range: 10.0.17763.0
    • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:-:*:x64:*range: <10.0.17763.8389
  • Microsoft/Windows Server 2025cpe-rescue2 versions
    10.0.26100.0+ 1 more
    • (no CPE)range: 10.0.26100.0
    • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*range: <10.0.26100.32313
  • Microsoft/Windows Server 20032 versions
    cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:-:*:x64:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:-:*:x64:*range: <10.0.20348.4711
    • (no CPE)range: 10.0.20348.0

Patches

Vulnerability mechanics

References

3

News mentions

0

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