CVE-2026-70354

.NET Core Remote Code Execution Vulnerability

State: Published
Severity: 7.8 High
Published: Aug 11, 2026
Updated: Oct 30, 2026
Reserved: Aug 4, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
.NET 10.0 runtimeMicrosoft	10.0.0 to before 10.0.11Affected
.NET 8.0 runtimeMicrosoft	8.0.0 to before 8.0.30Affected
.NET 9.0 runtimeMicrosoft	9.0.0 to before 9.0.19Affected
Microsoft .NET Framework 3.5Microsoft	3.5.0 to before 2.0.50727.8984 & 3.0.30729.8980Affected
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2Microsoft	3.0.0.0 to before 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4144.0Affected
Microsoft .NET Framework 3.5 AND 4.7.2Microsoft	4.7.0 to before 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0Affected
Microsoft .NET Framework 3.5 AND 4.8Microsoft	4.8.0 to before 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0Affected
Microsoft .NET Framework 3.5 AND 4.8.1Microsoft	4.8.1 to before 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9343.0Affected
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft	4.7.0 to before 4.7.4144.0Affected
Microsoft .NET Framework 4.8Microsoft	4.8.0 to before 4.8.4805.0Affected
Microsoft .NET Framework 4.8.1Microsoft	4.8.0.0 to before 4.8.9344.0Affected
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.38Affected
Microsoft Visual Studio 2026 version 18.8Microsoft	18.0 to before 18.8.3Affected

References

.NET Core Remote Code Execution Vulnerabilityvendor-advisorypatch

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