Double free in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.
Fix
Microsoft's update · Important
- KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
- KB5126653 — Windows 11 Version 23H2 · build 10.0.22631.7652 · restart required
- KB5127648 — Windows 11 Version 24H2 · build 10.0.26100.9711 · restart required
- KB5127648 — Windows 11 Version 25H2 · build 10.0.26200.9711 · restart required
- KB5127648 — Windows 11 Version 26H2 · build 10.0.26300.9711 · restart required
- KB5126646 — Windows Server 2025, Windows Server 2025 (Server Core installation) · build 10.0.26100.33650 · restart required
- KB5127646 — Windows 11 Version 26H1, Windows 11 version 26H1 · build 10.0.28000.3231 · restart required
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-29 · Exploitation Less Likely.
Patch, vendor advisory and mitigation references on NVD 1
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · microsoftNVD modified 2026-10-14 20:19
Affected (CPE criteria) 12
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*