diff --git a/packages/devextreme-scss/scss/widgets/generic/checkBox/_sizes.scss b/packages/devextreme-scss/scss/widgets/generic/checkBox/_sizes.scss
index 55d24ea98e3c..2fe26ef0c144 100644
--- a/packages/devextreme-scss/scss/widgets/generic/checkBox/_sizes.scss
+++ b/packages/devextreme-scss/scss/widgets/generic/checkBox/_sizes.scss
@@ -7,7 +7,7 @@
 $generic-checkbox-icon-font-size: null !default;
 
 $generic-checkbox-border-width: 1px !default;
-$generic-checkbox-border-radius: $base-border-radius-exsmall !default;
+$generic-checkbox-border-radius: null !default;
 
 $generic-checkbox-arrow-icon-size: 1em !default;
 $generic-checkbox-arrow-font-size: null !default;
@@ -18,10 +18,12 @@ $generic-checkbox-indeterminate-icon-border-radius: 2px !default;
   $generic-checkbox-icon-font-size: 22px !default;
   $generic-checkbox-arrow-font-size: 0.727273em !default;
   $generic-checkbox-indeterminate-icon-size: 0.545455em !default;
+  $generic-checkbox-border-radius: if($base-border-radius-exsmall, min($base-border-radius-exsmall, 2px), null) !default;
 }
 
 @else if $size == "compact" {
   $generic-checkbox-icon-font-size: 16px !default;
   $generic-checkbox-arrow-font-size: 0.625em !default;
   $generic-checkbox-indeterminate-icon-size: 0.5em !default;
+  $generic-checkbox-border-radius: if($base-border-radius-exsmall, min($base-border-radius-exsmall, 2px), null) !default;
 }
diff --git a/packages/devextreme-scss/scss/widgets/material/checkBox/_sizes.scss b/packages/devextreme-scss/scss/widgets/material/checkBox/_sizes.scss
index f7d9f0989a16..1acba7c28ef3 100644
--- a/packages/devextreme-scss/scss/widgets/material/checkBox/_sizes.scss
+++ b/packages/devextreme-scss/scss/widgets/material/checkBox/_sizes.scss
@@ -20,7 +20,7 @@ $material-checkbox-indeterminate-icon-width: null !default;
   $material-checkbox-icon-font-size: 18px !default;
   $material-checkbox-ripple-size: 2.222223em !default;
 
-  $material-checkbox-border-radius: $base-border-radius - 2px !default;
+  $material-checkbox-border-radius: min($base-border-radius - 2px, 2px) !default;
 
   $material-checkbox-arrow-font-size: 0.888889em !default;
   $material-checkbox-indeterminate-icon-height: 0.111112em !default;
@@ -31,7 +31,7 @@ $material-checkbox-indeterminate-icon-width: null !default;
   $material-checkbox-icon-font-size: 16px !default;
   $material-checkbox-ripple-size: 2em !default;
 
-  $material-checkbox-border-radius: $base-border-radius !default;
+  $material-checkbox-border-radius: min($base-border-radius, 2px) !default;
 
   $material-checkbox-arrow-font-size: 0.875em !default;
   $material-checkbox-indeterminate-icon-height: 0.125em !default;
diff --git a/packages/devextreme-scss/tests/checkbox-border-radius.test.ts b/packages/devextreme-scss/tests/checkbox-border-radius.test.ts
new file mode 100644
index 000000000000..588d5f118af6
--- /dev/null
+++ b/packages/devextreme-scss/tests/checkbox-border-radius.test.ts
@@ -0,0 +1,102 @@
+import * as path from 'path';
+import { compileStringAsync } from 'sass-embedded';
+
+const scssRoot = path.resolve(__dirname, '..', 'scss');
+
+const probeSelector = '.probe';
+
+const extractBorderRadius = (css: string): string | null => {
+  const match = css.match(/\.probe\s*\{\s*border-radius:\s*([^;}]+)/);
+  return match ? match[1].trim() : null;
+};
+
+const hasBorderRadiusDeclaration = (css: string): boolean => (
+  /\.probe\s*\{\s*border-radius:/.test(css)
+);
+
+const compile = async (source: string): Promise<string> => {
+  const result = await compileStringAsync(source, { loadPaths: [scssRoot] });
+  return result.css;
+};
+
+const genericSource = (baseBorderRadius: string): string => `
+  @use "widgets/generic/colors" with (
+    $color: "light",
+    $base-border-radius: ${baseBorderRadius}
+  );
+  @use "widgets/generic/sizes" with ($size: "default");
+  @use "widgets/generic/checkBox/sizes" as cb;
+
+  ${probeSelector} { border-radius: cb.$generic-checkbox-border-radius; }
+`;
+
+const genericContrastSource = (): string => `
+  @use "widgets/generic/colors" with ($color: "contrast");
+  @use "widgets/generic/sizes" with ($size: "default");
+  @use "widgets/generic/checkBox/sizes" as cb;
+
+  ${probeSelector} { border-radius: cb.$generic-checkbox-border-radius; }
+`;
+
+const materialSource = (
+  baseBorderRadius: string,
+  size: 'default' | 'compact' = 'default',
+): string => `
+  @use "widgets/material/colors" with ($color: "blue", $mode: "light");
+  @use "widgets/material/sizes" with (
+    $size: "${size}",
+    $base-border-radius: ${baseBorderRadius}
+  );
+  @use "widgets/material/checkBox/sizes" as cb;
+
+  ${probeSelector} { border-radius: cb.$material-checkbox-border-radius; }
+`;
+
+describe('CheckBox border-radius capping (T1330300)', () => {
+  describe('generic theme', () => {
+    test('default radius keeps the original (small) value', async () => {
+      const css = await compile(genericSource('2px'));
+      expect(extractBorderRadius(css)).toBe('0px');
+    });
+
+    test('large base-border-radius is capped at 2px', async () => {
+      const css = await compile(genericSource('12px'));
+      expect(extractBorderRadius(css)).toBe('2px');
+    })
+
+    test('intermediate base-border-radius is not over-clamped', async () => {
+      const css = await compile(genericSource('3px'));
+      expect(extractBorderRadius(css)).toBe('1px');
+    });
+
+    test('contrast color scheme (no exsmall) does not break compilation', async () => {
+      const css = await compile(genericContrastSource());
+      // $base-border-radius-exsmall is null in contrast → border-radius must
+      // stay null (no declaration emitted), not throw on min(null, 2px).
+      expect(hasBorderRadiusDeclaration(css)).toBe(false);
+    });
+  });
+
+  describe('material theme', () => {
+    test('default size: large base-border-radius is capped at 2px', async () => {
+      const css = await compile(materialSource('12px', 'default'));
+      expect(extractBorderRadius(css)).toBe('2px');
+    });
+
+    test('default size: small base-border-radius is not over-clamped', async () => {
+      const css = await compile(materialSource('3px', 'default'));
+      expect(extractBorderRadius(css)).toBe('1px');
+    });
+
+    test('compact size: large base-border-radius is capped at 2px', async () => {
+      const css = await compile(materialSource('12px', 'compact'));
+      expect(extractBorderRadius(css)).toBe('2px');
+    });
+
+    test('compact size: small base-border-radius is not over-clamped', async () => {
+      const css = await compile(materialSource('1px', 'compact'));
+      expect(extractBorderRadius(css)).toBe('1px');
+    });
+  });
+});
+