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HIGH · 7.8

CVE-2026-70354

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

Vulnerability Description

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftVisual Studio 2022>= 17.14.0, < 17.14.38
MicrosoftVisual Studio 2026>= 18.8.0, < 18.8.3
Microsoft.Net Framework4.8.1
MicrosoftWindows 11 26H1-
MicrosoftWindows 10 1607-
MicrosoftWindows Server 2012-
MicrosoftWindows Server 2016-
MicrosoftWindows 10 1809-
MicrosoftWindows Server 2019-
MicrosoftWindows 10 21H2-
MicrosoftWindows 10 22H2-
MicrosoftWindows 11 23H2-
MicrosoftWindows 11 24H2-
MicrosoftWindows 11 25H2-
MicrosoftWindows Server 2022-
MicrosoftWindows Server 2025-
Microsoft.Net>= 8.0.0, < 8.0.30
MicrosoftWindows-

Related Weaknesses (CWE)

CWE-787

References

FAQ

What is CVE-2026-70354?

CVE-2026-70354 is a vulnerability with a CVSS score of 7.8 (HIGH). Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

How severe is CVE-2026-70354?

CVE-2026-70354 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-70354?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Visual Studio 2022, Microsoft Visual Studio 2026, Microsoft .Net Framework, Microsoft Windows 11 26H1, Microsoft Windows 10 1607.