---
id: "CVE-2026-118750"
page: "https://infrastack.ai/live/CVE-2026-118750"
kind: "vulnerability"
aliases: ["CVE-2026-118750", "GHSA-6527-9fp8-r4x6"]
title: "Microsoft Security Advisory CVE-2026-118750 - ASP.NET Core Denial of Service Vulnerability"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "Microsoft.AspNetCore.WebUtilities", "fixed": ["2.3.14"], "affected": ">= 2.3.12, < 2.3.14", "ecosystem": "nuget"}, {"name": "Microsoft.AspNetCore.WebUtilities", "fixed": ["2.3.14"], "affected": ">= 2.3.0, <= 2.3.13", "ecosystem": "nuget"}]
ecosystems: ["nuget"]
tags: ["aspnet-core", "cwe-770", "denial-of-service", "dotnet", "nuget", "runtime", "web-apps"]
not_affected_if: []
published_at: "2026-11-10T19:19:51+00:00"
first_seen_at: "2026-11-10T19:24:55+00:00"
updated_at: "2026-11-10T23:34:09+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118750", "first_seen_at": "2026-11-10T19:24:55+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118750", "first_seen_at": "2026-11-10T22:58:47+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-118750", "https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-november-2026-servicing-updates/"]}, {"source": "ghsa", "url": "https://github.com/advisories/GHSA-6527-9fp8-r4x6", "first_seen_at": "2026-11-10T23:34:09+00:00"}]
exploit_sources: []
---

# Microsoft Security Advisory CVE-2026-118750 - ASP.NET Core Denial of Service Vulnerability

Link for people: https://infrastack.ai/live/CVE-2026-118750 (this .md is for agents)

ASP.NET Core does not limit or throttle some resource allocations, so a remote request can exhaust resources. An unauthenticated attacker over the network can make the service unavailable.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- nuget:Microsoft.AspNetCore.WebUtilities affected >= 2.3.12, < 2.3.14 fixed 2.3.14
- nuget:Microsoft.AspNetCore.WebUtilities affected >= 2.3.0, <= 2.3.13 fixed 2.3.14

## How to check

Run 'dotnet list package --include-transitive' in each project, or search packages.lock.json / *.csproj / deps.json for Microsoft.AspNetCore.WebUtilities. Versions 2.3.12 and 2.3.13 are affected.

## Fix

Update the Microsoft.AspNetCore.WebUtilities NuGet package to 2.3.14, then rebuild and redeploy. Fixed version taken from the affected range in the Microsoft CNA record; the MSRC advisory was not readable.

## Timeline

- 2026-11-10T19:24:55+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118750
- 2026-11-10T22:58:47+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-118750 — Microsoft CNA data (via NVD) names only the NuGet package Microsoft.AspNetCore.WebUtilities, affected >=2.3.12 <2.3.14. MSRC page is JS-only and could not be read; the Nov 2026 .NET servicing blog does not list this CVE. Nothing verified.
- 2026-11-10T23:34:09+00:00 ghsa https://github.com/advisories/GHSA-6527-9fp8-r4x6

## Documents

- [advisory] NVD CVE-2026-118750 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/CVE-2026-118750
- [advisory] Maintainer's advisory: api.github.com https://api.github.com/repos/dotnet/aspnetcore/security-advisories/GHSA-6527-9fp8-r4x6
- [advisory] Maintainer's advisory: github.com https://github.com/dotnet/aspnetcore/security/advisories/GHSA-6527-9fp8-r4x6
- [fix] Patch: github.com https://github.com/dotnet/aspnetcore/commit/9a26c7414a4fbff45535c0830253c1b4479b0073
- [mentions] .NET and .NET Framework November 2026 servicing updates https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-november-2026-servicing-updates/

## From the sources

## Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core. This advisory provides guidance on updating affected applications and components.

FileBufferingReadStream buffer allocation can allow unauthenticated multipart-form requests to exhaust memory.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/512

## CVSS Details

- **Version:** 3.1
- **Severity:** High
- **Score:** 7.5 (base score)
- **Vector:** `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`
- **Weakness:** CWE-770

## Affected Platforms

- **Platforms:** Any supported OS
- **Architectures:** All

## <a name="affected-packages"></a>Affected Packages

The table lists the affected package range and the fixed NuGet version.

### ASP.NET Core 2.3 - standalone packages

Package | Affected version | Patched version
--- | --- | ---
[Microsoft.AspNetCore.WebUtilities](https://www.nuget.org/packages/Microsoft.AspNetCore.WebUtilities) | >= 2.3.0, <= 2.3.13 | 2.3.14

## Advisory FAQ

### <a name="how-affected"></a>How do I know if I am affected?

Check the application's Microsoft.AspNetCore.WebUtilities package reference against the affected range above, including transitive dependencies brought in by Microsoft.AspNetCore.Http. Use `dotnet list <PROJECT> package --include-transitive` to inspect resolved dependencies.

### <a name="how-fix"></a>How do I fix the issue?

Update each applicable package reference to its patched version listed above, then rebuild and redeploy the application. Updating only the installed runtime does not update an application's standalone package references.

Applications referencing Microsoft.AspNetCore.Http must resolve Microsoft.AspNetCore.WebUtilities to version 2.3.14 or later. Add or update a direct WebUtilities reference if necessary to override an older transitive dependency.

## Other Information

### Reporting Security Issues

If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).

Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

### Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

### Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

### External Links

[CVE-2026-118750](https://www.cve.org/CVERecord?id=CVE-2026-118750)

### Acknowledgements

- NavSec4

### Revisions

V1.0 (November 10, 2026): Advisory published.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_