Out-of-Bounds Write in .NET Allows Unauthorized Access
CVE-2026-70197

8.1HIGH

Key Information:

Vendor

Microsoft
Status
.net 10.0 Installed On Linux
.net 10.0 Installed On Mac Os
.net 10.0 Installed On Windows
.net 10.0 Runtime
Vendor
CVE Published:
13 October 2026

What is CVE-2026-70197?

A critical vulnerability in the .NET Framework allows unauthorized attackers to exploit an out-of-bounds write condition, leading to potential remote code execution. This flaw enables attackers to execute arbitrary code on a targeted system via crafted network requests, posing significant risks to the integrity and confidentiality of affected systems. It is essential for organizations utilizing .NET to apply available patches and implement security best practices to safeguard against this vulnerability.

Affected Version(s)

.NET 10.0 installed on Linux 10.0.0 < 10.0.403

.NET 10.0 installed on Mac OS 10.0.0 < 10.0.403

.NET 10.0 installed on Windows 10.0.0 < 10.0.403

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.