High 7.5Published Oct 13, 2026

CVE-2026-97801.NET Framework Tampering Vulnerability

Updated under an hour ago (Oct 26, 2026, 1:50 PM ET)

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It affects Microsoft .NET Framework 3.5 and 7 other products. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.61%, higher than 49% of scored CVEs.

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Every CVE for Microsoft .NET Framework 3.5

Exploited in the last 30 days

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

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Weakness (CWE): CWE-1287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.61% (percentile 49)
Assigned by: microsoft
NVD analysis: Awaiting Analysis
Record last updated: Oct 25, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

Microsoft Microsoft .NET Framework 3.5 microsoft:net_framework_3.5 (from the name)	3.5.0 builds before 2.0.50727.9188 AND 3.0.30729.9171	CNA record
Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 microsoft:net_framework_3.5_and_4.6.2_4.7_4.7.1_4.7.2 (from the name)	3.0.0.0 builds before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0	CNA record
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 microsoft:net_framework_3.5_and_4.7.2 (from the name)	4.7.0 builds before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0	CNA record
Microsoft Microsoft .NET Framework 3.5 AND 4.8 microsoft:net_framework_3.5_and_4.8 (from the name)	4.8.0 builds before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0	CNA record
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 microsoft:net_framework_3.5_and_4.8.1 (from the name)	4.8.1 builds before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0	CNA record
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 microsoft:net_framework_4.6.2_4.7_4.7.1_4.7.2 (from the name)	from 4.7.0 before 4.7.4150.0	CNA record
Microsoft Microsoft .NET Framework 4.8 microsoft:net_framework_4.8 (from the name)	from 4.8.0 before 4.8.4811.0	CNA record
Microsoft Microsoft .NET Framework 4.8.1 microsoft:net_framework_4.8.1 (from the name)	from 4.8.0.0 before 4.8.9363.0	CNA record

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801	vendor-advisory, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.