diff --git a/pkgs/by-name/fl/flask-unsign/package.nix b/pkgs/by-name/fl/flask-unsign/package.nix
new file mode 100644
index 000000000000..4581ddb5244d
--- /dev/null
+++ b/pkgs/by-name/fl/flask-unsign/package.nix
@@ -0,0 +1 @@
+{ python3Packages }: with python3Packages; toPythonApplication flask-unsign
diff --git a/pkgs/development/python-modules/flask-unsign/default.nix b/pkgs/development/python-modules/flask-unsign/default.nix
new file mode 100644
index 000000000000..970e7ddb9c9d
--- /dev/null
+++ b/pkgs/development/python-modules/flask-unsign/default.nix
@@ -0,0 +1,50 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  flask,
+  itsdangerous,
+  markupsafe,
+  pytestCheckHook,
+  requests,
+  setuptools,
+  werkzeug,
+}:
+
+buildPythonPackage rec {
+  pname = "flask-unsign";
+  version = "1.2.1";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "Paradoxis";
+    repo = "Flask-Unsign";
+    tag = "v${version}";
+    hash = "sha256-/WK3g6Ef3mSKeT3aaSAh5J8estUN4sNmM9Tq9An/18A=";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [
+    flask
+    itsdangerous
+    markupsafe
+    requests
+    werkzeug
+  ];
+
+  nativeCheckInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [ "flask_unsign" ];
+
+  pytestFlagsArray = [ "tests/flask_unsign.py" ];
+
+  meta = {
+    description = "Command line tool to fetch, decode, brute-force and craft session cookies of Flask applications";
+    homepage = "https://github.com/Paradoxis/Flask-Unsign";
+    changelog = "https://github.com/Paradoxis/Flask-Unsign/releases/tag/${src.tag}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ fab ];
+    mainProgram = "flask-unsign";
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 5e6721686eb1..753bb2063e84 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5236,6 +5236,8 @@ self: super: with self; {
 
   flask-themes2 = callPackage ../development/python-modules/flask-themes2 { };
 
+  flask-unsign = callPackage ../development/python-modules/flask-unsign { };
+
   flask-versioned = callPackage ../development/python-modules/flask-versioned { };
 
   flask-webtest = callPackage ../development/python-modules/flask-webtest { };