diff --git a/src/validators/uuid.py b/src/validators/uuid.py
index ca6b1ba0..a3515d11 100644
--- a/src/validators/uuid.py
+++ b/src/validators/uuid.py
@@ -35,9 +35,9 @@ def uuid(value: Union[str, UUID], /):
         return False
     if isinstance(value, UUID):
         return True
-    try:
-        return UUID(value) or re.match(
-            r"^[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}$", value
-        )
-    except ValueError:
-        return False
+    # Deliberately not delegating to the stdlib UUID() constructor here:
+    # it accepts far more than this validator documents or tests, e.g.
+    # `urn:uuid:...`-prefixed and `{braced}` forms, and any UUID version
+    # (not just v4). A regex keeps acceptance limited to the plain
+    # (optionally dashed) hex form shown in the docstring and tests.
+    return bool(re.match(r"^[0-9a-fA-F]{8}-?([0-9a-fA-F]{4}-?){3}[0-9a-fA-F]{12}$", value))
diff --git a/tests/test_uuid.py b/tests/test_uuid.py
index b4f40d29..84d68725 100644
--- a/tests/test_uuid.py
+++ b/tests/test_uuid.py
@@ -32,6 +32,13 @@ def test_returns_true_on_valid_uuid(value: Union[str, UUID]):
         ("2bc1c94f-0deb-43e9-92a1-4775189ec9f",),
         ("gbc1c94f-0deb-43e9-92a1-4775189ec9f8",),
         ("2bc1c94f 0deb-43e9-92a1-4775189ec9f8",),
+        # Regression: the previous implementation delegated to the stdlib
+        # UUID() constructor, which is far more permissive than this
+        # validator's own docstring/regex -- it also accepts urn:-prefixed
+        # and {braced} forms, neither of which were ever documented,
+        # tested, or intended to pass here.
+        ("urn:uuid:2bc1c94f-0deb-43e9-92a1-4775189ec9f8",),
+        ("{2bc1c94f-0deb-43e9-92a1-4775189ec9f8}",),
     ],
 )
 def test_returns_failed_validation_on_invalid_uuid(value: Union[str, UUID]):