---
id: CVE-2026-50649
title: .NET Remote Code Execution Vulnerability
summary: >-
  Deserialization of untrusted data in .NET allows an unauthorized attacker to
  execute code locally.
severity: high
cvss: 7.8
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-502
vendor: Microsoft
product: .NET 8.0
affected:
  - .net_8.0 >= 8.0.0 < 8.0.29
  - .net_9.0 >= 9.0.0 < 9.0.18
  - .net_framework_3.5 >= 3.5.0 < 2.0.50727.9182 & 3.0.30729.9168
  - >-
    .net_framework_3.5_and_4.7.2 >= 4.7.0 < 2.0.50727.9069 & 3.0.30729.9067 &
    4.7.4143.0
  - >-
    .net_framework_3.5_and_4.8 >= 4.8.0 < 2.0.50727.9069 & 3.0.30729.9067 &
    4.8.4803.0
  - >-
    .net_framework_3.5_and_4.8.1 >= 4.8.1 < 2.0.50727.9182 & 3.0.30729.9168 &
    4.8.9339.0
  - .net_framework_4.6.2_4.7_4.7.1_4.7.2 >= 4.7.0 < 4.7.4143.0
  - .net_framework_4.8 >= 4.8.0 < 4.8.4803.0
  - .net_framework_4.8.1 >= 4.8.0.0 < 4.8.9340.0
  - visual_studio_2026_version_18.7 >= 18.0 < 18.7.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-15T03:57:18.474365Z'
published: '2026-07-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:23:22.124Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-50649'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50649'
    label: .NET Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.04017
epssPercentile: 0.90181
ingestedAt: '2026-09-08T17:06:31.914Z'
---

## Overview

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

## Affected

- `.net_8.0 >= 8.0.0 < 8.0.29`
- `.net_9.0 >= 9.0.0 < 9.0.18`
- `.net_framework_3.5 >= 3.5.0 < 2.0.50727.9182 & 3.0.30729.9168`
- `.net_framework_3.5_and_4.7.2 >= 4.7.0 < 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0`
- `.net_framework_3.5_and_4.8 >= 4.8.0 < 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0`
- `.net_framework_3.5_and_4.8.1 >= 4.8.1 < 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0`
- `.net_framework_4.6.2_4.7_4.7.1_4.7.2 >= 4.7.0 < 4.7.4143.0`
- `.net_framework_4.8 >= 4.8.0 < 4.8.4803.0`
- `.net_framework_4.8.1 >= 4.8.0.0 < 4.8.9340.0`
- `visual_studio_2026_version_18.7 >= 18.0 < 18.7.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.