Code Injection in Microsoft products - CVE-2026-50650

Vulnerability identifier: #VU138086

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-50650

CWE-ID: CWE-94

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to escalate privileges.

The vulnerability exists due to improper control of generation of code ('code injection') in .NET Framework when processing crafted local input. A local attacker can inject code to escalate privileges.

Successful exploitation could result in SYSTEM privileges.

Microsoft .NET Framework
.NET
Visual Studio
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
dotnet8.0 (Red Hat package)
dotnet9.0 (Red Hat package)

Install security update from vendor's website.

Microsoft .NET Framework - addressed in versions 2.0.50727.8983 & 3.0.30729.8978, 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0, 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0, 2.0.50727.9182 & 3.0.30729.9168, 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0, 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0, 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0, 4.7.4143.0, 4.8.4803.0, 4.8.9340.0
.NET - addressed in versions 8.0.29, 9.0.18
Visual Studio - update to 17.12.22
dotnet8.0 (Red Hat package) - update to 8.0.130-1.el10_0
dotnet9.0 (Red Hat package) - update to 9.0.120-1.el10_0

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-50650

• Multiple vulnerabilities in Visual Studio
• Red Hat Enterprise Linux 10 update for .NET 8.0
• Red Hat Enterprise Linux 10 update for .NET 9.0