CVE-2026-45491 — .NET Tampering Vulnerability

Affected: Microsoft .NET 10.0, Microsoft .NET 8.0, Microsoft .NET 9.0

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

USN-8420-1 — dotnet8, dotnet9, dotnet10 vulnerabilities

Affected: Ubuntu:22.04:LTS: dotnet8, Ubuntu:24.04:LTS: dotnet10, Ubuntu:24.04:LTS: dotnet8, Ubuntu:25.10: dotnet10, Ubuntu:25.10: dotnet8, Ubuntu:25.10: dotnet9, Ubuntu:26.04:LTS: dotnet10

It was discovered that .NET did not properly handle link resolution before file access. A local attacker could use this issue to perform unauthorized file tampering and write arbitrary files outside of the intended extraction directory. (CVE-2026-45491)

It was discovered that .NET did not properly handle deeply-nested MessagePack arrays. An attacker could use this to cause .NET to consume excessive resources, resulting in a denial of service. (CVE-2026-45591)

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CVE-2026-45491 — .NET Tampering Vulnerability

USN-8420-1 — dotnet8, dotnet9, dotnet10 vulnerabilities