Out-of-bounds write in Microsoft products - CVE-2026-70197
Published: October 14, 2026
Vulnerability identifier: #VU154634
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70197
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to an out-of-bounds write in .NET when processing network packets. A remote attacker can send a specially crafted packet to an affected service over the network to execute arbitrary code.
No user interaction is required. Successful exploitation requires a deep understanding of the system and the ability to manipulate its components to trigger a specific condition.
Affected software
.NET
Visual Studio
Microsoft .NET Framework
Visual Studio
Microsoft .NET Framework
How to mitigate CVE-2026-70197
Install security update from vendor's website.
.NET - addressed in versions 8.0.32, 9.0.21
Visual Studio - update to 17.14.42
Microsoft .NET Framework - update to 10.0.13
Visual Studio - update to 17.14.42
Microsoft .NET Framework - update to 10.0.13