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High MSRC-CVE-2026-70197 1 CVE

.NET and Visual Studio Remote Code Execution Vulnerability

Published Oct 13, 2026 · Updated Oct 25, 2026 · Revision 5

Vendor: Microsoft

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system and the ability to manipulate its components to trigger a specific condition. Successful exploitation is not guaranteed and depends on a combination of factors that may include the environment, system configuration, and the presence of additional security measures.

How could an attacker exploit this vulnerability?
An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.

Security updates
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
17.14.43 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
10.0.13 — https://support.microsoft.com/help/5130036
8.0.32 — https://support.microsoft.com/help/5130034
9.0.21 — https://support.microsoft.com/help/5130035
11.0.0-rc.2 — https://github.com/dotnet/announcements/issues/466
8.0.427 — https://support.microsoft.com/help/5133964
9.0.320 — https://support.microsoft.com/help/5133965
10.0.403 — https://support.microsoft.com/help/5133966
11.0.100-rc.3.26522.148 — https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc3/11.0.0-rc.3.md
16.11.61 — https://learn.microsoft.com/en-us/visualstudio/releases/2019/release-notes
18.12 Insiders 3 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes-insiders

Vulnerabilities 1

Revision history

  1. #5

    Updated product information in the Software Update table. This is an informational change only.

  2. #4

    Microsoft is aware that the vulnerability for which this CVE was assigned has not been addressed. We are working to prepare and test a complete mitigation. We will update this document when there is more information.

  3. #3

    Updated an acknowledgement. This is an informational change only.

  4. #2

    Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.

  5. #1

    Information published.

References