CVE-2026-26171 — .NET Denial of Service Vulnerability

Affected: Microsoft .NET 10.0, Microsoft .NET 8.0, Microsoft .NET 9.0, Microsoft PowerShell 7.5, Microsoft PowerShell 7.6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.4 Extended Update Support and 2 more

Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.

USN-8176-1 — 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

Ludvig Pedersen discovered that the System.Security.Cryptography.Xml library in .NET incorrectly handled certain XML inputs. An attacker could possibly use this issue to consume excessive resources, resulting in a denial of service. (CVE-2026-33116, CVE-2026-26171)

Ludvig Pedersen and Kevin Jones discovered that the System.Security.Cryptography.Xml library in .NET incorrectly handled certain XML inputs. An attacker could possibly use this issue to cause .NET to crash, resulting in a denial of service. (CVE-2026-32203)

Ludvig Pedersen discovered that the System.Net.Mail component in .NET incorrectly handled certain inputs. An attacker could possibly use this issue to perform a network spoofing attack. (CVE-2026-32178)

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CVE-2026-26171 — .NET Denial of Service Vulnerability

USN-8176-1 — dotnet8, dotnet9, dotnet10 vulnerabilities