Vulnerability · Published Oct 13, 2026 · Assigned by microsoft
CVE-2026-85790Microsoft QUIC Information Disclosure Vulnerability
Medium 5.9
In plain English
A medium-severity use-after-free in Microsoft.Native.Quic.MsQuic.Schannel from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.8%top 43.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dotnet10-runtime | 10.0.13-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.24 | dotnet10-runtime | 10.0.13-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.22 | dotnet8-runtime | 8.0.32-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.23 | dotnet8-runtime | 8.0.32-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.24 | dotnet8-runtime | 8.0.32-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.22 | dotnet9-runtime | 9.0.21-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.23 | dotnet9-runtime | 9.0.21-r0 | ALPINE-CVE-2026-85790 |
| Alpine:v3.24 | dotnet9-runtime | 9.0.21-r0 | ALPINE-CVE-2026-85790 |
| NuGet | microsoft.native.quic.msquic.schannel | 2.6.3 | GHSA-2mxg-prvg-9jfg |
| NuGet | microsoft.native.quic.msquic.schannel | 2.5.12 | GHSA-2mxg-prvg-9jfg |
| Ubuntu:22.04:LTS | dotnet7 | no fix listed | UBUNTU-CVE-2026-85790 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – before 17.14.42 |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 – before 18.10.4 |
| Microsoft | Microsoft.Native.Quic.MsQuic.Schannel | 1.9.0 – before 2.6.2 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – before 10.0.22631.7652 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 – before 10.0.22631.7652 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – before 10.0.26100.9711 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – before 10.0.26200.9711 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – before 10.0.28000.3231 |
| Microsoft | Windows 11 Version 26H2 | 10.0.26300.0 – before 10.0.26300.9711 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – before 10.0.20348.5761 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – before 10.0.26100.33650 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – before 10.0.26100.33650 |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
References
- Microsoft QUIC Information Disclosure Vulnerability vendor-advisory, patch