CVE-2026-97801
High
Description
Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Microsoft .NET Framework 3.5
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-1287CWE-1287
How to fix
Update
- Microsoft Microsoft .NET Framework 3.52.0.50727.9188 AND 3.0.30729.9171 or later
- Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.22.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 or later
- Microsoft Microsoft .NET Framework 3.5 AND 4.7.22.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 or later
- Microsoft Microsoft .NET Framework 3.5 AND 4.82.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 or later
- Microsoft Microsoft .NET Framework 3.5 AND 4.8.12.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 or later
- Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.24.7.4150.0 or later
- Microsoft Microsoft .NET Framework 4.84.8.4811.0 or later
- Microsoft Microsoft .NET Framework 4.8.14.8.9363.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft Microsoft .NET Framework 3.5 | 3.5.0 ≤ v < 2.0.50727.9188 AND 3.0.30729.9171 | 2.0.50727.9188 AND 3.0.30729.9171 |
| Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | 3.0.0.0 ≤ v < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 | 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 |
| Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 | 4.7.0 ≤ v < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 |
| Microsoft Microsoft .NET Framework 3.5 AND 4.8 | 4.8.0 ≤ v < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 |
| Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 | 4.8.1 ≤ v < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 | 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 |
| Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | 4.7.0 ≤ v < 4.7.4150.0 | 4.7.4150.0 |
| Microsoft Microsoft .NET Framework 4.8 | 4.8.0 ≤ v < 4.8.4811.0 | 4.8.4811.0 |
| Microsoft Microsoft .NET Framework 4.8.1 | 4.8.0.0 ≤ v < 4.8.9363.0 | 4.8.9363.0 |
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