CVE-2025-55247: Microsoft Security Advisory | .NET Denial of Service Vulnerability

CVE-2025-55247 · Severity: low · CVSS 3.1 · Published 2025-10-15

Microsoft Security Advisory CVE-2025-55247 | .NET Denial of Service Vulnerability

Technologies: Microsoft.Build.Tasks.Core (NuGet). Vendors: NuGet.

Quick answers

Is CVE-2025-55247 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-55247 being exploited in the wild.
How severe is CVE-2025-55247?
Low severity, with a CVSS score of 3.1, published 15 October 2025.
Which products and versions are affected?
Microsoft.Build (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107; Microsoft.Build.Tasks.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107; Microsoft.Build.Utilities.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107.
Is there a fix for CVE-2025-55247?
Yes. Microsoft.Build (NuGet): upgrade to 18.0.0-preview-25476-107 or later; Microsoft.Build.Tasks.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later; Microsoft.Build.Utilities.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-55247?
Check whether you run Microsoft.Build (NuGet), Microsoft.Build.Tasks.Core (NuGet) or Microsoft.Build.Utilities.Core (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Microsoft.Build (NuGet): upgrade to 18.0.0-preview-25476-107 or later
    dotnet add package Microsoft.Build --version 18.0.0-preview-25476-107
  • Microsoft.Build.Tasks.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later
    dotnet add package Microsoft.Build.Tasks.Core --version 18.0.0-preview-25476-107
  • Microsoft.Build.Utilities.Core (NuGet): upgrade to 18.0.0-preview-25476-107 or later
    dotnet add package Microsoft.Build.Utilities.Core --version 18.0.0-preview-25476-107

Affected products

  • Microsoft.Build (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107
  • Microsoft.Build.Tasks.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107
  • Microsoft.Build.Utilities.Core (NuGet) ECOSYSTEM:introduced=17.15.0-preview-25277-114,fixed=18.0.0-preview-25476-107

Identifiers

  • CVE-2025-55247
  • GHSA-w3q9-fxm7-j8fq

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.