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CVE-2026-85790

5.9 medium SSVC exploitation: none Analyzed
NVD · CVE.org

Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

Fix

Microsoft's update · Important

  • KB5127648 — Windows 11 Version 26H2 · build 10.0.26300.9711 · restart required
  • Release Notes — Microsoft Visual Studio 2026 version 18.10 · build 18.10.4 · restart required
  • Release Notes — Microsoft Visual Studio 2022 version 17.14 · build 17.14.42 · restart required
  • Release Notes — Microsoft.Native.Quic.MsQuic.Schannel on .NET 10.0 runtime installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 11.0 runtime installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 8.0 runtime installed on Windows, Microsoft.Native.Quic.MsQuic.Schannel on .NET 9.0 runtime installed on Windows · build 2.6.2
  • KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
  • KB5126646 — Windows Server 2025 (Server Core installation), Windows Server 2025 · build 10.0.26100.33650 · restart required
  • KB5127648 — Windows 11 Version 25H2 · build 10.0.26200.9711 · 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
  • 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 2026-10-28 · 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 3

  1. Cpes+15 CPE criteria (now 15)NVD modified 2026-10-16 18:43
  2. StatusAwaiting Analysis → AnalyzedNVD modified 2026-10-16 18:43
  3. First seenCVSS 5.9NVD modified 2026-10-13 21:19

Affected (CPE criteria) 15

  • 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:*
  • cpe:2.3:a:microsoft:native.quic.msquic.schannel:*:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*

References 1