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Vulnerabilities

Vulnerability · CVE-2026-97801

.NET Framework Tampering Vulnerability

Published Oct 13, 2026 · catalog updated Oct 14, 2026 · Microsoft Microsoft .NET Framework 3.5

Check if you run it

No confirmed exploitation is on record for CVE-2026-97801. EPSS is 0.61%. Act only if a listed version of Microsoft Microsoft .NET Framework 3.5 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.61%
Remediation
Advisory link
Affected products
vendor Microsoft Microsoft .NET Framework 3.5 · vendor Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 · vendor Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 · vendor Microsoft Microsoft .NET Framework 3.5 AND 4.8 · vendor Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 · vendor Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Microsoft .NET Framework 3.5version unspecified
  • vendor Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2version unspecified
  • vendor Microsoft Microsoft .NET Framework 3.5 AND 4.7.2version unspecified
  • vendor Microsoft Microsoft .NET Framework 3.5 AND 4.8version unspecified
  • vendor Microsoft Microsoft .NET Framework 3.5 AND 4.8.1version unspecified
  • vendor Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2version unspecified
  • vendor Microsoft Microsoft .NET Framework 4.8version unspecified
  • vendor Microsoft Microsoft .NET Framework 4.8.1version unspecified

How to fix CVE-2026-97801

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-97801. EPSS is 0.61%. Act only if a listed version of Microsoft Microsoft .NET Framework 3.5 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1287. EPSS 0.61%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · CIRCL Vulnerability Lookup

    Detected

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

  2. Oct 14, 2026 · CIRCL Vulnerability Lookup

    Updated

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

Sources

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.