Input validation error in .NET - CVE-2026-35433

Vulnerability identifier: #VU131323

CSH Severity: Low

CVSS v4: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-35433

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to escalate privileges on the target system.

The vulnerability exists due to insufficient validation of user-supplied input in .NET. A local attacker can gain elevated privileges on the system.

.NET
Fedora
dotnet8.0
dotnet9.0
dotnet10.0

Install updates from vendor's website.

.NET - addressed in versions 8.0.27, 9.0.16
dotnet8.0 - addressed in versions 8.0.127-1.fc42, 8.0.127-1.fc43, 8.0.127-1.fc44
dotnet9.0 - addressed in versions 9.0.117-1.fc42, 9.0.117-1.fc43, 9.0.117-1.fc44
dotnet10.0 - addressed in versions 10.0.108-1.fc42, 10.0.108-1.fc43, 10.0.108-1.fc44

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35433

• Multiple vulnerabilities in Microsoft .NET
• Fedora 42 update for dotnet9.0
• Fedora 43 update for dotnet9.0
• Fedora 44 update for dotnet9.0
• Fedora 42 update for dotnet10.0
• Fedora 43 update for dotnet10.0
• Fedora 44 update for dotnet10.0
• Fedora 42 update for dotnet8.0
• Fedora 43 update for dotnet8.0
• Fedora 44 update for dotnet8.0