CVE-2026-83520

.NET Remote Code Execution Vulnerability

State: Published
Severity: 8.8 High
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Aug 31, 2026

Description

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
.NET 10.0 runtimeMicrosoft	10.0.0 to before 10.0.13Affected
.NET 11.0 runtimeMicrosoft	11.0.0 to before 11.0.0-rc.2Affected
.NET 8.0 runtimeMicrosoft	8.0.0 to before 8.0.32Affected
.NET 9.0 runtimeMicrosoft	9.0.0 to before 9.0.21Affected
Microsoft .NET Framework 3.5Microsoft	3.5.0 to before 2.0.50727.9188 AND 3.0.30729.9171Affected
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2Microsoft	3.0.0.0 to before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0Affected
Microsoft .NET Framework 3.5 AND 4.7.2Microsoft	4.7.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0Affected
Microsoft .NET Framework 3.5 AND 4.8Microsoft	4.8.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0Affected
Microsoft .NET Framework 3.5 AND 4.8.1Microsoft	4.8.1 to before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0Affected
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft	4.7.0 to before 4.7.4150.0Affected
Microsoft .NET Framework 4.8Microsoft	4.8.0 to before 4.8.4811.0Affected
Microsoft .NET Framework 4.8.1Microsoft	4.8.0.0 to before 4.8.9363.0Affected
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.42Affected
Microsoft Visual Studio 2026 version 18.10Microsoft	18.10.0 to before 18.10.4Affected

References

.NET Remote Code Execution Vulnerabilityvendor-advisorypatch

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