Use After Free in Microsoft Microsoft.native.quic.msquic.schannel
CVE-2026-85790
Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft Microsoft.native.quic.msquic.schannel
- Microsoft Visual Studio 2022 Version 17.14
- Microsoft Visual Studio 2026 Version 18.10
- Microsoft Windows 11 Version 23h2
- Microsoft Windows 11 Version 24h2
- Microsoft Windows 11 Version 25h2
- Microsoft Windows 11 Version 26h1
- Microsoft Windows 11 Version 26h2
- Microsoft Windows Server 2022
- Microsoft Windows Server 2025
Weakness classification (CWE)
References
- Microsoft QUIC Information Disclosure Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-85790?
- CVE-2026-85790 is a medium-severity vulnerability in Microsoft Microsoft.native.quic.msquic.schannel, classified under Use After Free. CVSS score: 5.9/10. Published 2026-10-13.
- How severe is CVE-2026-85790?
- Medium severity. CVSS v3 base score is 5.9 out of 10.