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Advisory record · GHSA-h4j7-5rxr-p4wc

Microsoft.Build.Tasks.Core .NET Spoofing Vulnerability

CVSS 8.0 HighEPSS 0.013 · 70th percentile

Published by the GitHub Advisory Database at 13 May 2025, 21:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Microsoft.Build.Tasks.CoreNuGet>=15.8.166, <15.9.30 || >=16.0.461, <16.11.6 || >=17.0.0, <17.8.29 || >=17.9.5, <17.10.29 || >=17.11.4, <17.12.36 || >=17.12.6, <17.13.26 || >=17.13.9, <17.14.815.9.30, 16.11.6, 17.8.29, 17.10.29, 17.12.36, 17.13.26, 17.14.8
Identifiers
GHSA-h4j7-5rxr-p4wc · BIT-dotnet-2025-26646 · BIT-dotnet-sdk-2025-26646 · CVE-2025-26646
Weakness (CWE)
CWE-73
Tags
Published
13 May 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Microsoft.Build.Tasks.Core versions from 15.8.166 up to (but not including) the fixed releases 15.9.30, 16.11.6, 17.8.29, 17.10.29, 17.12.36, 17.13.26 and 17.14.8 are affected. The source describes external control of a file name or path that lets an unauthorized attacker perform spoofing over a network, though it gives few details on exact conditions. Projects that do not use the DownloadFile build task are stated not to be susceptible; otherwise, upgrade to the patched version for your release line.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.0 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.013, the 70th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:21 UTC First seen by agentprime
  2. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.