4 files changed, 67 insertions, 0 deletions
diff --git a/fuzz/Jellyfin.Api.Fuzz/Jellyfin.Api.Fuzz.csproj b/fuzz/Jellyfin.Api.Fuzz/Jellyfin.Api.Fuzz.csproj
new file mode 100644
index 000000000..da46e63a5
--- /dev/null
+++ b/fuzz/Jellyfin.Api.Fuzz/Jellyfin.Api.Fuzz.csproj
@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="Jellyfin.Api">
+      <HintPath>Jellyfin.Api.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../../MediaBrowser.Common/MediaBrowser.Common.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SharpFuzz" />
+  </ItemGroup>
+
+</Project>
diff --git a/fuzz/Jellyfin.Api.Fuzz/Program.cs b/fuzz/Jellyfin.Api.Fuzz/Program.cs
new file mode 100644
index 000000000..6713322ac
--- /dev/null
+++ b/fuzz/Jellyfin.Api.Fuzz/Program.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using Jellyfin.Api.Middleware;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Features;
+using Microsoft.Extensions.Primitives;
+using SharpFuzz;
+
+namespace Jellyfin.Api.Fuzz
+{
+    public static class Program
+    {
+        public static void Main(string[] args)
+        {
+            switch (args[0])
+            {
+                case "UrlDecodeQueryFeature": Run(UrlDecodeQueryFeature); return;
+                default: throw new ArgumentException($"Unknown fuzzing function: {args[0]}");
+            }
+        }
+
+        private static void Run(Action<string> action) => Fuzzer.OutOfProcess.Run(action);
+
+        private static void UrlDecodeQueryFeature(string data)
+        {
+            var dict = new Dictionary<string, StringValues>
+            {
+                { data, StringValues.Empty }
+            };
+            _ = new UrlDecodeQueryFeature(new QueryFeature(new QueryCollection(dict)));
+        }
+    }
+}
diff --git a/fuzz/Jellyfin.Api.Fuzz/Testcases/UrlDecodeQueryFeature/test1.txt b/fuzz/Jellyfin.Api.Fuzz/Testcases/UrlDecodeQueryFeature/test1.txt
new file mode 100644
index 000000000..73f356b93
--- /dev/null
+++ b/fuzz/Jellyfin.Api.Fuzz/Testcases/UrlDecodeQueryFeature/test1.txt
@@ -0,0 +1 @@
+a%3D1%26b%3D2%26c%3D3
diff --git a/fuzz/Jellyfin.Api.Fuzz/fuzz.sh b/fuzz/Jellyfin.Api.Fuzz/fuzz.sh
new file mode 100755
index 000000000..edf965562
--- /dev/null
+++ b/fuzz/Jellyfin.Api.Fuzz/fuzz.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -e
+
+dotnet build -c Release ../../Jellyfin.Api/Jellyfin.Api.csproj --output bin
+sharpfuzz bin/Jellyfin.Api.dll
+cp bin/Jellyfin.Api.dll .
+
+dotnet build
+mkdir -p Findings
+AFL_SKIP_BIN_CHECK=1 afl-fuzz -i "Testcases/$1" -o "Findings/$1" -t 5000 ./bin/Debug/net7.0/Jellyfin.Api.Fuzz "$1"