CVE-2026-97801
.NET Framework Tampering Vulnerability
CVE-2026-97801 is fixed in 27 products on 1 platform, first by KB5126868, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0073
54th percentile
<p>Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607 | 14393.9612 | KB5126868 | Oct 13, 2026 |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | 14393.9612 | KB5126868 | Oct 13, 2026 |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019 | KB5127666 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 | KB5127666 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809 | KB5127685 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2 | KB5127683 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 | KB5127683 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | KB5127685 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 | KB5127687 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2 | KB5127689 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 | KB5127689 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2 | KB5127692 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2 | KB5127690 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2 | KB5127690 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2 | KB5127694 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 | KB5127693 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 | KB5127690 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 on Windows 11 version 26H1 | KB5127696 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 on Windows Server 2012 | KB5127660 | Oct 13, 2026 | |
| Microsoft .NET Framework 3.5 on Windows Server 2012 R2 | KB5127664 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 | KB5127667 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 | KB5127668 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.8 on Windows 10 version 1607 | KB5127684 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2012 | KB5127686 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2012 R2 | KB5127688 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.8 on Windows Server 2016 | KB5127684 | Oct 13, 2026 | |
| Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 | KB5127691 | Oct 13, 2026 | |
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