.NET 9.0 vulnerabilities | LiveThreat CVE Feed

Product

.NET 9.0

by Microsoft · last CVE Sep 8, 2026

CVEs

On KEV

9.8

Max CVSS

New 30D

Vulnerabilities29 In the news1 Timeline

Severity mix

Critical 1High 23Medium 5Low 0

Severity

All severities29 Critical1 High23 Medium5 Low0

Exploitation

On CISA KEV0 Exploited in the wild0

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Add .NET 9.0 to your stack to get only the CVEs that touch what you run.

CVE	CVSS	EPSS	Published	Summary · affected versions
CVE-2026-71328	8.8	1%	Sep 8	.NET and Visual Studio Remote Code Execution Vulnerability Affected: 9.0.0 before 9.0.20
CVE-2026-69439	8.8	1%	Sep 8	.NET and Visual Studio Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.20
CVE-2026-69522	8.8	1%	Sep 8	.NET and Visual Studio Remote Code Execution Vulnerability Affected: 9.0.0 before 9.0.20
CVE-2025-21176	8.8	2%	Jan 14	.NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability Affected: 9.0.0 before 9.0.1
CVE-2025-26646	8.0	1%	May 13	.NET, Visual Studio, and Build Tools for Visual Studio Spoofing Vulnerability Affected: 9.0.0 before 9.0.5
CVE-2026-45490	7.8	0%	Jun 9	.NET SDK Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.17
CVE-2026-45591	7.5	2%	Jun 9	ASP.NET Core Denial of Service Vulnerability Affected: 9.0.0 before 9.0.17
CVE-2026-42899	7.5	2%	May 12	ASP.NET Core Denial of Service Vulnerability Affected: 9.0.0 before 9.0.16
CVE-2026-32203	7.5	2%	Apr 14	.NET and Visual Studio Denial of Service Vulnerability Affected: 9.0.0 before 9.0.15
CVE-2026-26171	7.5	2%	Apr 14	.NET Denial of Service Vulnerability Affected: 9.0.0 before 9.0.15
CVE-2026-33116	7.5	2%	Apr 14	.NET, .NET Framework, and Visual Studio Denial of Service Vulnerability Affected: 9.0.0 before 9.0.15
CVE-2026-32178	7.5	2%	Apr 14	.NET Spoofing Vulnerability Affected: 9.0.0 before 9.0.15
CVE-2026-26127	7.5	2%	Mar 10	.NET Denial of Service Vulnerability Affected: 9.0.0 before 9.0.14
CVE-2026-21218	7.5	1%	Feb 10	.NET Spoofing Vulnerability Affected: 9.0.0 before 9.0.13
CVE-2025-30399	7.5	1%	Jun 13	.NET and Visual Studio Remote Code Execution Vulnerability Affected: 9.0.0 before 9.0.6
CVE-2025-21172	7.5	2%	Jan 14	.NET and Visual Studio Remote Code Execution Vulnerability Affected: 9.0.0 before 9.0.1
CVE-2025-21171	7.5	2%	Jan 14	.NET Remote Code Execution Vulnerability Affected: 9.0.0 before 9.0.1
CVE-2024-43499	7.5	3%	Nov 12	.NET and Visual Studio Denial of Service Vulnerability Affected: 9.0.0 before 9.0.0
CVE-2026-35433	7.3	1%	May 12	.NET Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.16
CVE-2026-32177	7.3	1%	May 12	.NET Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.16
CVE-2025-55247	7.3	1%	Oct 14	.NET Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.10
CVE-2025-21173	7.3	1%	Jan 14	.NET Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.1
CVE-2026-69806	7.0	1%	Sep 8	.NET Elevation of Privilege Vulnerability Affected: 9.0.0 before 9.0.20