# CVE-2025-26646: Microsoft.Build.Tasks.Core .NET Spoofing Vulnerability

Source: https://junglewise.ai/threats/cve-2025-26646-microsoft-build-tasks-core-net-spoofing-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-05-13  
License: CC BY 4.0 with a link back

CVE-2025-26646 · Severity: low · CVSS 3.1 · Published 2025-05-13

Microsoft.Build.Tasks.Core .NET Spoofing Vulnerability

Technologies: [Microsoft.Build.Tasks.Core (NuGet)](https://junglewise.ai/threats/technologies/microsoft-build-tasks-core). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2025-26646 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-26646 being exploited in the wild.

**How severe is CVE-2025-26646?** Low severity, with a CVSS score of 3.1, published 13 May 2025.

**Which products and versions are affected?** Microsoft.Build.Tasks.Core (NuGet) ECOSYSTEM:introduced=15.8.166,fixed=15.9.30.

**Is there a fix for CVE-2025-26646?** Yes. Microsoft.Build.Tasks.Core (NuGet): upgrade to 15.9.30 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-26646?** Check whether you run Microsoft.Build.Tasks.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.Tasks.Core (NuGet): upgrade to 15.9.30 or later

  ```sh
  dotnet add package Microsoft.Build.Tasks.Core --version 15.9.30
  ```


## Affected products

- Microsoft.Build.Tasks.Core (NuGet) ECOSYSTEM:introduced=15.8.166,fixed=15.9.30

## Identifiers

- CVE-2025-26646
- GHSA-h4j7-5rxr-p4wc

## Related threats

- [Microsoft Security Advisory | .NET Denial of Service Vulnerability](https://junglewise.ai/threats/cve-2025-55247-microsoft-security-advisory-net-denial-of-service-vulnerability)
- [Duplicate Advisory: Microsoft Security Advisory | .NET Denial of Service Vulnerability](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-net-denial-of-service-31c2c048)