CVE-2026-62899
Medium
Description
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Microsoft .net
PublishedAug 11, 2026
First seenAug 11, 2026
Weakness typeCWE-444CWE-444
How to fix
Update
- microsoft .net8.0.30, 9.0.19, 10.0.11 or later
- microsoft visual_studio_202217.14.38 or later
- microsoft visual_studio_202618.8.3 or later
- Microsoft.NETCore.App.Runtime.linux-arm10.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.linux-arm6410.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.linux-musl-arm10.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.linux-musl-arm6410.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.linux-musl-x6410.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.linux-x6410.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.osx-arm6410.0.11, 9.0.19, 8.0.30 or later
- Microsoft.NETCore.App.Runtime.osx-x6410.0.11, 9.0.19, 8.0.30 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft .net | 8.0.0 ≤ v < 8.0.30, 9.0.0 ≤ v < 9.0.19, 10.0.0 ≤ v < 10.0.11 | 8.0.30, 9.0.19, 10.0.11 |
| microsoft visual_studio_2022 | 17.14.0 ≤ v < 17.14.38 | 17.14.38 |
| microsoft visual_studio_2026 | 18.8.0 ≤ v < 18.8.3 | 18.8.3 |
| Microsoft.NETCore.App.Runtime.linux-armNuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.linux-arm64NuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.linux-musl-armNuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.linux-musl-arm64NuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.linux-musl-x64NuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.linux-x64NuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.osx-arm64NuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
| Microsoft.NETCore.App.Runtime.osx-x64NuGet | 10.0.0 ≤ v < 10.0.11, 9.0.0 ≤ v < 9.0.19, 8.0.0 ≤ v < 8.0.30 | 10.0.11, 9.0.19, 8.0.30 |
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