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Findings

CVE-2026-70181

Microsoft Security Advisory CVE-2026-70181 - ASP.NET Core Denial of Service Vulnerability

Published Oct 13, 2026

Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.WebUtilities. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. FileBufferingReadStream eagerly rents buffers during multipart processing, allowing memory exhaustion and denial of service.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · GitLab Advisory Database

    Detected

    Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.WebUtilities. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. FileBufferingReadStream eagerly rents buffers during multipart processing, allowing memory exhaustion and denial of service.

Affected

  • nuget microsoft.aspnetcore.app.runtime.linux-armversion unspecified
  • nuget microsoft.aspnetcore.app.runtime.linux-arm64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.linux-musl-armversion unspecified
  • nuget microsoft.aspnetcore.app.runtime.linux-musl-arm64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.linux-musl-x64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.linux-x64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.osx-arm64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.osx-x64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.win-armversion unspecified
  • nuget microsoft.aspnetcore.app.runtime.win-arm64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.win-x64version unspecified
  • nuget microsoft.aspnetcore.app.runtime.win-x86version unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-70181

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-70181

    30-day exploitation probability 1.1%

    first.org
  • GitLab Advisory DatabasePackage advisoryCVE-2026-70181

    Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.WebUtilities. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. FileBufferingReadStream eagerly rents buffers during multipart processing, allowing memory exhaustion and denial of service.

    advisories.gitlab.com