---
id: CVE-2026-56170
title: ASP.NET Core Denial of Service Vulnerability
summary: >-
  Allocation of resources without limits or throttling in ASP.NET Core 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-770
vendor: Microsoft
product: .NET 10.0
affected:
  - .net_10.0 >= 10.0.0 < 10.0.10
  - .net_8.0 >= 8.0.0 < 8.0.29
  - .net_9.0 >= 9.0.0 < 9.0.18
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-07-14T17:49:27.269476Z'
published: '2026-07-14'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T22:29:13.532Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56170'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56170'
    label: ASP.NET Core Denial of Service Vulnerability
  - url: >-
      https://github.com/dotnet/aspnetcore/security/advisories/GHSA-j8gr-8fp3-5q5h
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56170'
  - url: 'https://github.com/dotnet/announcements/issues/424'
  - url: 'https://github.com/dotnet/aspnetcore/discussions/67787'
  - url: 'https://github.com/advisories/GHSA-j8gr-8fp3-5q5h'
tags:
  - cve.org
  - ghsa
  - nuget
epss: 0.01174
epssPercentile: 0.66142
aliases:
  - GHSA-j8gr-8fp3-5q5h
ecosystem: nuget
patched:
  - Microsoft.AspNetCore.App.Runtime.linux-arm 10.0.6
  - Microsoft.AspNetCore.App.Runtime.linux-arm64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.linux-musl-arm 10.0.6
  - Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.linux-musl-x64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.linux-x64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.osx-arm64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.osx-x64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.win-arm 10.0.6
  - Microsoft.AspNetCore.App.Runtime.win-arm64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.win-x64 10.0.6
  - Microsoft.AspNetCore.App.Runtime.win-x86 10.0.6
  - Microsoft.AspNetCore.App.Runtime.linux-arm 9.0.15
  - Microsoft.AspNetCore.App.Runtime.linux-arm64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.linux-musl-arm 9.0.15
  - Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.linux-musl-x64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.linux-x64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.osx-arm64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.osx-x64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.win-arm 9.0.15
  - Microsoft.AspNetCore.App.Runtime.win-arm64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.win-x64 9.0.15
  - Microsoft.AspNetCore.App.Runtime.win-x86 9.0.15
  - Microsoft.AspNetCore.App.Runtime.linux-arm 8.0.26
  - Microsoft.AspNetCore.App.Runtime.linux-arm64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.linux-musl-arm 8.0.26
  - Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.linux-musl-x64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.linux-x64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.osx-arm64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.osx-x64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.win-arm 8.0.26
  - Microsoft.AspNetCore.App.Runtime.win-arm64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.win-x64 8.0.26
  - Microsoft.AspNetCore.App.Runtime.win-x86 8.0.26
ingestedAt: '2026-07-21T16:51:41.770Z'
---

## Overview

Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.

## Affected

- `.net_10.0 >= 10.0.0 < 10.0.10`
- `.net_8.0 >= 8.0.0 < 8.0.29`
- `.net_9.0 >= 9.0.0 < 9.0.18`

## Remediation

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

## Package advisory (CVE-2026-56170)

Affected packages:

- `Microsoft.AspNetCore.App.Runtime.linux-arm >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.linux-arm64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-x64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.linux-x64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.osx-arm64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.osx-x64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.win-arm >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.win-arm64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.win-x64 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.win-x86 >= 10.0.0, <= 10.0.5`
- `Microsoft.AspNetCore.App.Runtime.linux-arm >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.linux-arm64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-x64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.linux-x64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.osx-arm64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.osx-x64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.win-arm >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.win-arm64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.win-x64 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.win-x86 >= 9.0.0, <= 9.0.14`
- `Microsoft.AspNetCore.App.Runtime.linux-arm >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.linux-arm64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-x64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.linux-x64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.osx-arm64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.osx-x64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.win-arm >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.win-arm64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.win-x64 >= 8.0.0, <= 8.0.25`
- `Microsoft.AspNetCore.App.Runtime.win-x86 >= 8.0.0, <= 8.0.25`

Patched in:

- `Microsoft.AspNetCore.App.Runtime.linux-arm 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.linux-arm64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-x64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.linux-x64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.osx-arm64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.osx-x64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.win-arm 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.win-arm64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.win-x64 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.win-x86 10.0.6`
- `Microsoft.AspNetCore.App.Runtime.linux-arm 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.linux-arm64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-x64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.linux-x64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.osx-arm64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.osx-x64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.win-arm 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.win-arm64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.win-x64 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.win-x86 9.0.15`
- `Microsoft.AspNetCore.App.Runtime.linux-arm 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.linux-arm64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.linux-musl-x64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.linux-x64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.osx-arm64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.osx-x64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.win-arm 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.win-arm64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.win-x64 8.0.26`
- `Microsoft.AspNetCore.App.Runtime.win-x86 8.0.26`

Source: https://github.com/advisories/GHSA-j8gr-8fp3-5q5h