CVE-2026-83520
Awaiting Analysis
Awaiting Analysis - Queue
Deserialization of Untrusted Data in .NET Framework
Vulnerability report for CVE-2026-83520, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-13
Assigner: Microsoft Corporation
Description
Description
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | .NET | 10.0 10.0.0 |
| Microsoft | .NET | 11.0 11.0.0 |
| Microsoft | .NET | 8.0 8.0.0 |
| Microsoft | .NET | 9.0 9.0.0 |
| Microsoft | Microsoft | .NET Framework 3.5 3.5.0 |
| Microsoft | Microsoft | .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 3.0.0.0 |
| Microsoft | Microsoft | .NET Framework 3.5 AND 4.7.2 4.7.0 |
| Microsoft | Microsoft | .NET Framework 3.5 AND 4.8 4.8.0 |
| Microsoft | Microsoft | .NET Framework 3.5 AND 4.8.1 4.8.1 |
| Microsoft | Microsoft | .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0 |
| Microsoft | Microsoft | .NET Framework 4.8 4.8.0 |
| Microsoft | Microsoft | .NET Framework 4.8.1 4.8.0.0 |
| Microsoft | Microsoft | Visual Studio 2022 version 17.14 17.14.0 |
| Microsoft | Microsoft | Visual Studio 2026 version 18.10 18.10.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-502 | The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. |
