---
id: CVE-2026-32203
title: .NET and Visual Studio Denial of Service Vulnerability
summary: >-
  Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized
  attacker to deny service over a network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-121
  - CWE-20
  - CWE-787
vendor: Microsoft
product: .NET 10.0
affected:
  - .net_10.0 >= 10.0.0 < 10.0.6
  - .net_8.0 >= 8.0.0 < 8.0.26
  - .net_9.0 >= 9.0.0 < 9.0.15
  - visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.19
  - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.30
  - visual_studio_2026_version_18.4 >= 18.4.0 < 18.4.4
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-04-15T10:41:37.792331Z'
published: '2026-04-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:26:12.373Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-32203'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32203'
    label: .NET and Visual Studio Denial of Service Vulnerability
  - url: 'https://github.com/dotnet/runtime/security/advisories/GHSA-6588-8gv4-xfgh'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-32203'
  - url: 'https://github.com/dotnet/runtime/issues/126891'
  - url: 'https://github.com/dotnet/announcements/issues/391'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32203.json
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2457740'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-32203'
  - url: 'https://access.redhat.com/errata/RHSA-2026:9205'
  - url: 'https://access.redhat.com/errata/RHSA-2026:9080'
  - url: 'https://access.redhat.com/errata/RHSA-2026:9077'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8475'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8474'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8473'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8472'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8471'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8470'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8469'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8468'
  - url: 'https://access.redhat.com/errata/RHSA-2026:8467'
  - url: 'https://access.redhat.com/errata/RHSA-2026:13693'
  - url: 'https://access.redhat.com/errata/RHSA-2026:13283'
  - url: 'https://access.redhat.com/errata/RHSA-2026:13282'
  - url: 'https://access.redhat.com/errata/RHSA-2026:13281'
  - url: 'https://access.redhat.com/errata/RHSA-2026:13280'
  - url: 'https://github.com/advisories/GHSA-6588-8gv4-xfgh'
tags:
  - cve.org
  - ghsa
  - nuget
epss: 0.02444
epssPercentile: 0.83631
aliases:
  - GHSA-6588-8gv4-xfgh
ecosystem: nuget
patched:
  - System.Security.Cryptography.Xml 10.0.6
  - System.Security.Cryptography.Xml 9.0.15
  - System.Security.Cryptography.Xml 8.0.3
ingestedAt: '2026-07-28T21:39:18.343Z'
---

## Overview

Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a network.

## Affected

- `.net_10.0 >= 10.0.0 < 10.0.6`
- `.net_8.0 >= 8.0.0 < 8.0.26`
- `.net_9.0 >= 9.0.0 < 9.0.15`
- `visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.19`
- `visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.30`
- `visual_studio_2026_version_18.4 >= 18.4.0 < 18.4.4`

## Remediation

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

## Package advisory (CVE-2026-32203)

Affected packages:

- `System.Security.Cryptography.Xml >= 10.0.0, <= 10.0.5`
- `System.Security.Cryptography.Xml >= 9.0.0, <= 9.0.14`
- `System.Security.Cryptography.Xml >= 8.0.0, <= 8.0.2`

Patched in:

- `System.Security.Cryptography.Xml 10.0.6`
- `System.Security.Cryptography.Xml 9.0.15`
- `System.Security.Cryptography.Xml 8.0.3`

Source: https://github.com/advisories/GHSA-6588-8gv4-xfgh