diff --git a/pkgs/by-name/ce/certmitm/package.nix b/pkgs/by-name/ce/certmitm/package.nix
new file mode 100644
index 000000000000..0b754cc54c11
--- /dev/null
+++ b/pkgs/by-name/ce/certmitm/package.nix
@@ -0,0 +1,45 @@
+{
+  lib,
+  fetchFromGitHub,
+  python3,
+}:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "certmitm";
+  version = "0-unstable-2025-05-14";
+  pyproject = false;
+
+  src = fetchFromGitHub {
+    owner = "aapooksman";
+    repo = "certmitm";
+    rev = "f04c91a1ba231762ec126487f593f9b4d33f4ec2";
+    hash = "sha256-i4DnOyn56lA63hI40uxtXX8dzMa29BPQQHWKFdVjVlM=";
+  };
+
+  dependencies = with python3.pkgs; [
+    dpkt
+    pyopenssl
+  ];
+
+  installPhase = ''
+    runHook preInstall
+
+    install -vD certmitm.py $out/bin/certmitm
+    install -vd $out/${python3.sitePackages}/
+    cp -R certmitm $out/${python3.sitePackages}
+
+    runHook postInstall
+  '';
+
+  # Project has not tests
+  doCheck = false;
+
+  meta = {
+    description = "Tool for testing for certificate validation vulnerabilities of TLS connections";
+    homepage = "https://github.com/aapooksman/certmitm";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ fab ];
+    mainProgram = "certmitm";
+    platforms = lib.platforms.all;
+  };
+}