CVE-2026-97801: Microsoft .net Framework 3.5

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.

Affected products

• Microsoft Microsoft .net Framework 3.5
• Microsoft Microsoft .net Framework 3.5 And 4.6.2/4.7/4.7.1/4.7.2
• Microsoft Microsoft .net Framework 3.5 And 4.7.2
• Microsoft Microsoft .net Framework 3.5 And 4.8
• Microsoft Microsoft .net Framework 3.5 And 4.8.1
• Microsoft Microsoft .net Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0, before 4.7.4150.0 (fixed in 4.7.4150.0)
• Microsoft Microsoft .net Framework 4.8: from 4.8.0, before 4.8.4811.0 (fixed in 4.8.4811.0)
• Microsoft Microsoft .net Framework 4.8.1: from 4.8.0.0, before 4.8.9363.0 (fixed in 4.8.9363.0)

Published 2026-10-13. Last modified 2026-10-13.