High severity · published Oct 13, 2026
CVE-2026-70197
.NET and Visual Studio Remote Code Execution Vulnerability
8.1
CVSS
0.8%
EPSS
No
On KEV
Description
Out-of-bounds write in .NET allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N1
.NET 10.0 installed on Linux · Microsoft
10.0.0 before 10.0.403 · source: vendor
N1
.NET 10.0 installed on Mac OS · Microsoft
10.0.0 before 10.0.403 · source: vendor
N1
.NET 10.0 installed on Windows · Microsoft
10.0.0 before 10.0.403 · source: vendor
N1
.NET 10.0 runtime · Microsoft
10.0.0 before 10.0.13 · source: vendor
N1
.NET 11.0 installed on Linux · Microsoft
11.0.0-preview.1 before 11.0.100-rc.3 · source: vendor
N1
.NET 11.0 installed on Mac OS · Microsoft
11.0.0-preview.1 before 11.0.100-rc.3 · source: vendor
N1
.NET 11.0 installed on Windows · Microsoft
11.0.0-preview.1 before 11.0.100-rc.3.26522.148 · source: vendor
N1
.NET 11.0 runtime · Microsoft
11.0.0 before 11.0.0-rc.2 · source: vendor
N8
.NET 8.0 installed on Linux · Microsoft
8.0.0 before 8.0.427 · source: vendor
N8
.NET 8.0 installed on Mac OS · Microsoft
8.0.0 before 8.0.427 · source: vendor
N8
.NET 8.0 installed on Windows · Microsoft
8.0.0 before 8.0.427 · source: vendor
N8
.NET 8.0 runtime · Microsoft
8.0.0 before 8.0.32 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70197
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70197
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70197
More from .NET 10.0 installed on Linux
8.8
CVE-2026-102870
ASP.NET Core Remote Code Execution Vulnerability