CVE-2026-85790: Microsoft QUIC Information Disclosure Vulnerability
This Microsoft advisory covers CVE-2026-85790 in Windows Server 2022 and Windows Server 2025.
- CVE-2026-85790
Key facts
- Vendor rating
- Medium, CVSS 5.9
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Microsoft Visual Studio 2022 version 17.14 17.14.0 before 17.14.42; Microsoft Visual Studio 2026 version 18.10 18.10.0 before 18.10.4; Microsoft.Native.Quic.MsQuic.Schannel 1.9.0 before 2.6.2 and 9 more below
- Fixed in
- KB5127648 (build 10.0.26100.9711), KB5126655 (build 10.0.20348.5761), KB5126646 (build 10.0.26100.33650) and 2 more below
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Microsoft QUIC Information Disclosure Vulnerability
Affected products named by the advisory: Windows Server 2022; Windows Server 2025.
Text from the source record.
- Microsoft Visual Studio 2022 version 17.14 17.14.0 before 17.14.42
- Microsoft Visual Studio 2026 version 18.10 18.10.0 before 18.10.4
- Microsoft.Native.Quic.MsQuic.Schannel 1.9.0 before 2.6.2
- Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7652
- Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7652
- Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9711
- Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9711
- Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.3231
- Windows 11 Version 26H2 10.0.26300.0 before 10.0.26300.9711
- Windows Server 2022 10.0.20348.0 before 10.0.20348.5761
- Windows Server 2025 10.0.26100.0 before 10.0.26100.33650
- Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.33650
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-85790
Upgrade to a fixed release named by Microsoft:
- KB5127648 (build 10.0.26100.9711)
- KB5126655 (build 10.0.20348.5761)
- KB5126646 (build 10.0.26100.33650)
- KB5126653 (build 10.0.22631.7652)
- KB5127646 (build 10.0.28000.3231)
Vendor guidance
- Install the applicable security update for your platform: KB5127648, KB5126655, KB5126646, KB5126653, KB5127646 (see the Microsoft Update Catalog).
End-of-life dates for Windows Server
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