---
id: CVE-2026-69439
title: >-
  Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized
  attacker to elevate privileges over a network.
summary: >-
  Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized
  attacker to elevate privileges over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: Microsoft
product: .NET 10.0
affected:
  - .net_10.0 >= 10.0.0 < 10.0.12
  - .net_11.0 >= 11.0.0 < 11.0 RC1
  - .net_8.0 >= 8.0.0 < 8.0.31
  - .net_9.0 >= 9.0.0 < 9.0.20
  - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.40
  - visual_studio_2026_version_18.9 >= 18.9.0 < 18.9.3
published: '2026-09-08'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T10:18:31.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69439'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69439'
    label: secure@microsoft.com
  - url: 'https://github.com/dotnet/runtime/security/advisories/GHSA-527h-q9f6-p7qx'
  - url: 'https://nvd.nist.gov/vuln/detail/cve-2026-69439'
  - url: 'https://github.com/advisories/GHSA-527h-q9f6-p7qx'
tags:
  - nvd
  - cve.org
  - ghsa
  - nuget
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T04:18:13.070091Z'
ingestedAt: '2026-09-08T19:08:49.612Z'
aliases:
  - GHSA-527h-q9f6-p7qx
ecosystem: nuget
patched:
  - Microsoft.DiaSymReader.Native 18.9.0-beta1.26405.2
epss: 0.00859
epssPercentile: 0.56822
---

## Overview

Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.

## Remediation

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

## Package advisory (CVE-2026-69439)

Affected packages:

- `Microsoft.DiaSymReader.Native >= 17.10.0-beta1.24272.1, <= 18.9.0-beta1.26405.1`

Patched in:

- `Microsoft.DiaSymReader.Native 18.9.0-beta1.26405.2`

Source: https://github.com/advisories/GHSA-527h-q9f6-p7qx