From 2904fc7cb42ab2fab5d9941a9440a5e1c2fdb888 Mon Sep 17 00:00:00 2001
From: Pitchfork-and-Torch
 <297513015+Pitchfork-and-Torch@users.noreply.github.com>
Date: Fri, 18 Sep 2026 04:04:50 +0000
Subject: [PATCH] Reject bool for Schema(int) type checks

bool is a subclass of int, so Schema(int) accepted True/False and
treated them as 0/1. Reject booleans explicitly so integer fields
cannot be satisfied by a bool. Schema(bool) is unchanged.
---
 voluptuous/schema_builder.py |  4 ++++
 voluptuous/tests/tests.py    | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/voluptuous/schema_builder.py b/voluptuous/schema_builder.py
index 3673e86..5f28d90 100644
--- a/voluptuous/schema_builder.py
+++ b/voluptuous/schema_builder.py
@@ -828,6 +828,10 @@ def _compile_scalar(schema):
     if inspect.isclass(schema):
 
         def validate_instance(path, data):
+            # bool is a subclass of int; reject so True/False are not valid ints
+            if schema is int and isinstance(data, bool):
+                msg = 'expected %s' % schema.__name__
+                raise er.TypeInvalid(msg, path)
             if isinstance(data, schema):
                 return data
             else:
diff --git a/voluptuous/tests/tests.py b/voluptuous/tests/tests.py
index 0608548..98220c7 100644
--- a/voluptuous/tests/tests.py
+++ b/voluptuous/tests/tests.py
@@ -2375,3 +2375,20 @@ def test_complex_required_keys_with_specific_value_validation():
     error_msg = str(exc_info.value)
     assert "required" not in error_msg.lower()  # No "required field missing" error
     assert "value must be at most 100" in error_msg  # Range validation error
+
+
+def test_boolean_is_not_an_integer():
+    """bool is a subclass of int; Schema(int) must still reject True/False."""
+    schema = Schema(int)
+    with pytest.raises(MultipleInvalid):
+        schema(True)
+    with pytest.raises(MultipleInvalid):
+        schema(False)
+    assert schema(0) == 0
+    assert schema(1) == 1
+    with pytest.raises(MultipleInvalid):
+        Schema({'age': int})({'age': True})
+    with pytest.raises(MultipleInvalid):
+        Schema(ExactSequence([int, int]))([True, False])
+    assert Schema(bool)(True) is True
+    assert Schema(bool)(False) is False