diff --git a/csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/PackagesConfigRestorer.cs b/csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/PackagesConfigRestorer.cs
index 2348eb809f8c..294349e66f92 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/PackagesConfigRestorer.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/PackagesConfigRestorer.cs
@@ -35,7 +35,7 @@ internal class PackagesConfigRestoreFactory
     {
         public static IPackagesConfigRestore Create(IFileProvider fileProvider, DependencyDirectory packageDirectory, Semmle.Util.Logging.ILogger logger, FeedManager feedManager)
         {
-            if (SystemBuildActions.Instance.IsWindows() || SystemBuildActions.Instance.IsMonoInstalled())
+            if ((SystemBuildActions.Instance.IsWindows() || SystemBuildActions.Instance.IsMonoInstalled()) && !feedManager.HasPrivateRegistryFeeds)
             {
                 return new NugetExeWrapper(fileProvider, packageDirectory, logger, feedManager);
             }
@@ -252,7 +252,7 @@ public int InstallPackages()
             {
                 if (PackageCount > 0)
                 {
-                    logger.LogInfo("Found packages.config files, but nuget.exe cannot be used to restore packages on this platform. Skipping restore of packages.config files.");
+                    logger.LogInfo("Found packages.config files, but nuget.exe cannot be used to restore packages on this platform or if private registry feeds are configured. Skipping restore of packages.config files.");
                 }
                 return 0;
             }
diff --git a/csharp/ql/lib/change-notes/2026-10-28-nugetcli-proxy-config.md b/csharp/ql/lib/change-notes/2026-10-28-nugetcli-proxy-config.md
new file mode 100644
index 000000000000..b23147588306
--- /dev/null
+++ b/csharp/ql/lib/change-notes/2026-10-28-nugetcli-proxy-config.md
@@ -0,0 +1,5 @@
+---
+category: minorAnalysis
+---
+
+- When private NuGet registries are configured, the extractor now attempts to restore dependencies listed in `packages.config` files using `dotnet restore` instead of the NuGet CLI so that the private registry configuration is respected.