Heap-based buffer overflow in Microsoft products - CVE-2026-32177

Vulnerability identifier: #VU131324

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-2026-32177

CWE-ID: CWE-122

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 a boundary error in .NET. A local attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the system.

Microsoft .NET Framework
.NET
Visual Studio
Fedora
dotnet8.0
dotnet9.0
dotnet10.0

Install updates from vendor's website.

Microsoft .NET Framework - update to 4.8.9334.0 and 4.8.4802.0
.NET - addressed in versions 8.0.27, 9.0.16
Visual Studio - addressed in versions 15.9.80, 16.11.56, 17.12.20
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-2026-32177

• 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