diff --git a/.github/workflows/mayhem.yml b/.github/workflows/mayhem.yml
new file mode 100644
index 0000000..6b185ad
--- /dev/null
+++ b/.github/workflows/mayhem.yml
@@ -0,0 +1,72 @@
+name: Mayhem
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    name: '${{ matrix.os }} shared=${{ matrix.shared }} ${{ matrix.build_type }}'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        shared: [false]
+        build_type: [Release]
+        include:
+          - os: ubuntu-latest
+            triplet: x64-linux
+
+    steps:
+      - uses: actions/checkout@v6.0.2
+        with:
+          submodules: recursive
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v4.1.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v6.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v7.1.0
+        with:
+          context: .
+          push: true
+          file: mayhem/Dockerfile
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+    outputs:
+      image: ${{ steps.meta.outputs.tags }}
+
+  mayhem:
+    needs: build
+    name: 'fuzz ${{ matrix.mayhemfile }}'
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        mayhemfile:
+          - mayhem/Mayhemfile
+
+    steps:
+      - uses: actions/checkout@v6.0.2
+
+      - name: Start analysis for ${{ matrix.mayhemfile }}
+        uses: forallsecure/mcode-action@long-runs
+        with:
+          mayhem-token: ${{ secrets.MAYHEM_TOKEN }}
+          args: --image ${{ needs.build.outputs.image }} --file ${{ matrix.mayhemfile }} --duration 600
+      
diff --git a/mayhem/Dockerfile b/mayhem/Dockerfile
new file mode 100644
index 0000000..bd33a24
--- /dev/null
+++ b/mayhem/Dockerfile
@@ -0,0 +1,12 @@
+FROM fuzzers/atheris:2.0.7-python3.9
+
+RUN apt-get update
+
+ADD . /src
+WORKDIR /src
+
+RUN python3 -m pip install --upgrade pip
+RUN python3 -m pip install codext
+RUN chmod +x /src/mayhem/fuzz-codext.py
+
+CMD ["/src/mayhem/fuzz-codext.py"]
diff --git a/mayhem/Mayhemfile b/mayhem/Mayhemfile
new file mode 100644
index 0000000..d5140ff
--- /dev/null
+++ b/mayhem/Mayhemfile
@@ -0,0 +1,6 @@
+project: python-codext
+target: fuzz-codext
+
+cmds:
+  - cmd: /src/mayhem/fuzz-codext.py
+    libfuzzer: true
diff --git a/mayhem/fuzz-codext.py b/mayhem/fuzz-codext.py
new file mode 100755
index 0000000..58d97c0
--- /dev/null
+++ b/mayhem/fuzz-codext.py
@@ -0,0 +1,26 @@
+#! /usr/bin/python3
+
+import atheris
+import sys
+import io
+import random
+
+with atheris.instrument_imports():
+    import codext
+
+def TestOneInput(input_bytes):
+    try:
+        fdp = atheris.FuzzedDataProvider(input_bytes)
+        data = fdp.ConsumeString(sys.maxsize)
+        encoded = codext.encode(data, "base100")
+    except UnicodeDecodeError:
+        pass
+    except ValueError:
+        pass
+
+def main():
+    atheris.Setup(sys.argv, TestOneInput)
+    atheris.Fuzz()
+
+if __name__ == "__main__":
+    main()