fkie_cve-2026-85790

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

GHSA-2mxg-prvg-9jfg — Microsoft Security Advisory CVE-2026-85790 - .NET Information Disclosure Vulnerability

Affected: NuGet: Microsoft.Native.Quic.MsQuic.Schannel

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.Native.Quic.MsQuic.Schannel. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

Various vulnerabilities in MsQuic are addressed by an updated native-binary dependency update.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/470

## CVSS Details

- **Version:** 3.1 - **Severity:** Moderate - **Score:** 5.9 - **Vector:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`

- **Weakness:** CWE-416 (Use After Free) ## Affected Platforms

- **Platforms:** Windows - **Architectures:** All

## <a name="affected-packages"></a>Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name | Affected version | Patched version ------------ | ---------------- | --------------- [Microsoft.Native.Quic.MsQuic.Schannel](https://www.nuget.org/packages/Microsoft.Native.Quic.MsQuic.Schannel) | >= 1.9.0, <= 2.6.1 | 2.6.2

## Advisory FAQ

### <a name="how-affected"></a>How do I know if I am affected?

If using a package listed in [affected packages](#affected-packages), you're exposed to the vulnerability.

### <a name="how-fix"></a>How do I fix the issue?

1. To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual…

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fkie_cve-2026-85790

GHSA-2mxg-prvg-9jfg — Microsoft Security Advisory CVE-2026-85790 - .NET Information Disclosure Vulnerability