Vulnerability in Microsoft .Net Framework 3.5

CVE-2026-97801

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

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-1287

References

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

Frequently asked questions

What is CVE-2026-97801?: CVE-2026-97801 is a high-severity vulnerability in Microsoft .Net Framework 3.5, classified under CWE-1287. CVSS score: 7.5/10. Published 2026-10-13.
How severe is CVE-2026-97801?: High severity. CVSS v3 base score is 7.5 out of 10.