diff --git a/packages/flutter/lib/src/material/input_border.dart b/packages/flutter/lib/src/material/input_border.dart
index 1da20f7..ae9314a 100644
--- a/packages/flutter/lib/src/material/input_border.dart
+++ b/packages/flutter/lib/src/material/input_border.dart
@@ -244,9 +244,22 @@
     TextDirection? textDirection,
   }) {
     if (borderRadius.bottomLeft != Radius.zero || borderRadius.bottomRight != Radius.zero) {
-      canvas.clipPath(getOuterPath(rect, textDirection: textDirection));
+      // This prevents the border from leaking the color due to anti-aliasing rounding errors.
+      final BorderRadius updatedBorderRadius = BorderRadius.only(
+        bottomLeft: borderRadius.bottomLeft.clamp(maximum: Radius.circular(rect.height / 2)),
+        bottomRight: borderRadius.bottomRight.clamp(maximum: Radius.circular(rect.height / 2)),
+      );
+
+      // We set the strokeAlign to center, so the behavior is consistent with
+      // drawLine and with the historical behavior of this border.
+      BoxBorder.paintNonUniformBorder(canvas, rect,
+          textDirection: textDirection,
+          borderRadius: updatedBorderRadius,
+          bottom: borderSide.copyWith(strokeAlign: BorderSide.strokeAlignCenter),
+          color: borderSide.color);
+    } else {
+      canvas.drawLine(rect.bottomLeft, rect.bottomRight, borderSide.toPaint());
     }
-    canvas.drawLine(rect.bottomLeft, rect.bottomRight, borderSide.toPaint());
   }
 
   @override
diff --git a/packages/flutter/test/material/input_decorator_test.dart b/packages/flutter/test/material/input_decorator_test.dart
index eed10b5..081a125 100644
--- a/packages/flutter/test/material/input_decorator_test.dart
+++ b/packages/flutter/test/material/input_decorator_test.dart
@@ -5000,14 +5000,15 @@
     final RenderBox box = tester.renderObject(find.byType(InputDecorator));
 
     // Fill is the border's outer path, a rounded rectangle
-    expect(box, paints..path(
+    expect(box, paints
+    ..drrect(
       style: PaintingStyle.fill,
-      color: const Color(0xFF00FF00),
-      includes: <Offset>[const Offset(800.0/2.0, 56/2.0)],
-      excludes: <Offset>[
-        const Offset(1.0, 56.0 - 6.0), // bottom left
-        const Offset(800 - 1.0, 56.0 - 6.0), // bottom right
-      ],
+      inner: RRect.fromLTRBAndCorners(0.0, 0.0, 800.0, 47.5,
+          bottomRight: const Radius.elliptical(12.0, 11.5),
+          bottomLeft: const Radius.elliptical(12.0, 11.5)),
+      outer: RRect.fromLTRBAndCorners(0.0, 0.0, 800.0, 48.5,
+          bottomRight: const Radius.elliptical(12.0, 12.5),
+          bottomLeft: const Radius.elliptical(12.0, 12.5)),
     ));
   });
 
@@ -6934,4 +6935,40 @@
       expect(decoration.isCollapsed, true);
     });
   });
+
+  testWidgets('UnderlineInputBorder clips top border to prevent anti-aliasing glitches', (WidgetTester tester) async {
+    const Rect canvasRect = Rect.fromLTWH(0, 0, 100, 100);
+    const UnderlineInputBorder border = UnderlineInputBorder(
+      borderRadius: BorderRadius.all(Radius.circular(12.0)),
+    );
+    expect(
+      (Canvas canvas) => border.paint(canvas, canvasRect),
+      paints
+        ..drrect(
+          outer: RRect.fromLTRBAndCorners(0.0, 0.0, 100.0, 100.5,
+                bottomRight: const Radius.elliptical(12.0, 12.5),
+                bottomLeft: const Radius.elliptical(12.0, 12.5)),
+          inner: RRect.fromLTRBAndCorners(0.0, 0.0, 100.0, 99.5,
+                bottomRight: const Radius.elliptical(12.0, 11.5),
+                bottomLeft: const Radius.elliptical(12.0, 11.5)),
+        ),
+    );
+
+    const UnderlineInputBorder border2 = UnderlineInputBorder(
+      borderRadius: BorderRadius.all(Radius.circular(60.0)),
+    );
+    expect(
+      (Canvas canvas) => border2.paint(canvas, canvasRect),
+      paints
+        ..drrect(
+          outer: RRect.fromLTRBAndCorners(0.0, 0.0, 100.0, 100.5,
+                bottomRight: const Radius.elliptical(50.0, 50.5),
+                bottomLeft: const Radius.elliptical(50.0, 50.5)),
+          inner: RRect.fromLTRBAndCorners(0.0, 0.0, 100.0, 99.5,
+                bottomRight: const Radius.elliptical(50.0, 49.5),
+                bottomLeft: const Radius.elliptical(50.0, 49.5)),
+        ),
+      reason: 'clamp is expected',
+    );
+  });
 }