CVE-2026-50649: .NET Remote Code Execution Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-14 · updated 2026-11-01
Weakness: CWE-502

Description

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally.

Affected products

Microsoft .NET: from 8.0.0 before 8.0.29; from 9.0.0 before 9.0.18 — fixed in 8.0.29, 9.0.18
Microsoft .NET Framework: 3.5; 4.8.1, 4.8, 4.6.2, 4.7, 4.7.1, 4.7.2 (and their updates)
Microsoft Visual Studio 2026 version 18.9: from 18.7.0 before 18.7.4 — fixed in 18.7.4
Microsoft .NET 8.0 runtime: from 8.0.0 before 8.0.29 — fixed in 8.0.29
Microsoft .NET 9.0 runtime: from 9.0.0 before 9.0.18 — fixed in 9.0.18
Microsoft .NET Framework 3.5: from 3.5.0 before 2.0.50727.9182 & 3.0.30729.9168 — fixed in 2.0.50727.9182 & 3.0.30729.9168
Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 — fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 — fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1 before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before 4.7.4143.0 — fixed in 4.7.4143.0
Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.4803.0 — fixed in 4.8.4803.0
Microsoft .NET Framework 4.8.1: from 4.8.0.0 before 4.8.9340.0 — fixed in 4.8.9340.0
Microsoft Visual Studio 2026 version 18.7: from 18.0 before 18.7.4 — fixed in 18.7.4

How to fix

Upgrade to a fixed version: Microsoft .NET 8.0.29, 9.0.18; Microsoft Visual Studio 2026 version 18.9 18.7.4; Microsoft .NET 8.0 runtime 8.0.29; Microsoft .NET 9.0 runtime 9.0.18; Microsoft .NET Framework 3.5 2.0.50727.9182 & 3.0.30729.9168; Microsoft .NET Framework 3.5 AND 4.7.2 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0; Microsoft .NET Framework 3.5 AND 4.8 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0; Microsoft .NET Framework 3.5 AND 4.8.1 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.4143.0; Microsoft .NET Framework 4.8 4.8.4803.0; Microsoft .NET Framework 4.8.1 4.8.9340.0; Microsoft Visual Studio 2026 version 18.7 18.7.4. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50649

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