medium6.5
CVE-2026-50659
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
Impact
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.NetCore.App.Runtime.linux-arm | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.linux-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.linux-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.osx-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.osx-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.win-arm | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.win-arm64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.win-x64 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
| nuget | Microsoft.NetCore.App.Runtime.win-x86 | >= 10.0.0, <= 10.0.9 | 10.0.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | .Net Framework | Versions 4.8.1, 4.8, 4.6.2, 4.7, 4.7.1, 4.7.2 |
| Microsoft | .Net | from 8.0.0 before 8.0.29 from 9.0.0 before 9.0.18 from 10.0.0 before 10.0.6 |
| Microsoft | Visual Studio 2022 | from 17.12.0 before 17.12.22 from 17.14.0 before 17.14.36 |
| Microsoft | Visual Studio 2026 | from 18.7.0 before 18.7.4 |
| Microsoft | .NET 10.0 Runtime | from 10.0.0 before 10.0.10 |
| Microsoft | .NET 8.0 Runtime | from 8.0.0 before 8.0.29 |
| Microsoft | .NET 9.0 Runtime | from 9.0.0 before 9.0.18 |
| Microsoft | Microsoft .NET Framework 3.5 | from 3.5.0 before 2.0.50727.8983 & 3.0.30729.8978 Version 3.5.0 <2.0.50727.8983 & 3.0.30729.8978 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 | from 4.7.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 | from 4.8.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 Version 4.8.0 <2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 | from 4.8.1 before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 Version 4.8.1 <2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | from 4.7.0 before 4.7.4143.0 |
| Microsoft | Microsoft .NET Framework 4.8 | from 4.8.0 before 4.8.4803.0 |
| Microsoft | Microsoft .NET Framework 4.8.1 | from 4.8.0.0 before 4.8.9340.0 |
| Microsoft | Microsoft Visual Studio 2022 Version 17.12 | from 17.12.0 before 17.12.22 |
| Microsoft | Microsoft Visual Studio 2022 Version 17.14 | from 17.14.0 before 17.14.36 |
| Microsoft | Microsoft Visual Studio 2026 Version 18.7 | from 18.0 before 18.7.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-74jp-vm22-8q8x
- https://github.com/dotnet/runtime/security/advisories/GHSA-74jp-vm22-8q8x
- https://nvd.nist.gov/vuln/detail/CVE-2026-50659
- https://github.com/dotnet/announcements/issues/423
- https://github.com/dotnet/runtime/issues/130716
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659