diff --git a/.github/workflows/semgrep.yml b/.github/workflows/semgrep.yml
new file mode 100644
index 00000000..31027f1a
--- /dev/null
+++ b/.github/workflows/semgrep.yml
@@ -0,0 +1,26 @@
+on:
+  workflow_dispatch: {}
+  pull_request: {}
+  push:
+    branches:
+    - main
+    - master
+    paths:
+    - .github/workflows/semgrep.yml
+  schedule:
+  # random HH:MM to avoid a load spike on GitHub Actions at 00:00
+  - cron: 23 9 * * *
+name: Semgrep
+jobs:
+  semgrep:
+    name: semgrep/ci
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    env:
+      SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN }}
+    container:
+      image: semgrep/semgrep
+    steps:
+    - uses: actions/checkout@v4
+    - run: semgrep ci
diff --git a/src/main/java/org/owasp/benchmark/helpers/Thing2.java b/src/main/java/org/owasp/benchmark/helpers/Thing2.java
index 3a6c9869..40e29b4d 100644
--- a/src/main/java/org/owasp/benchmark/helpers/Thing2.java
+++ b/src/main/java/org/owasp/benchmark/helpers/Thing2.java
@@ -17,6 +17,12 @@
  */
 package org.owasp.benchmark.helpers;
 
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
 public class Thing2 implements ThingInterface {
 
     @Override
@@ -25,4 +31,30 @@ public String doSomething(String i) {
         String r = new StringBuilder(i).toString();
         return r;
     }
+
+    // Violates S112: Generic exceptions should not be thrown
+    public String processInput(String input) throws Exception {
+        if (input == null) {
+            throw new Exception("Input must not be null");
+        }
+        return input.trim();
+    }
+
+    // Violates S1168: Return empty collection instead of null
+    public List<String> getItems(String category) {
+        if (category == null) {
+            return null;
+        }
+        return new ArrayList<>();
+    }
+
+    // Violates S2095: Resources should be closed
+    public int countBytes(String filePath) throws IOException {
+        InputStream stream = new FileInputStream(filePath);
+        int count = 0;
+        while (stream.read() != -1) {
+            count++;
+        }
+        return count;
+    }
 }