diff --git a/src/content/asset-url.ts b/src/content/asset-url.ts
index 70916d1..a437e6d 100644
--- a/src/content/asset-url.ts
+++ b/src/content/asset-url.ts
@@ -6,7 +6,7 @@ const normalizeAssetBase = (base: string): string => {
   if (
     !base.startsWith('/') ||
     base.startsWith('//') ||
-    /[\\%?#]/u.test(base) ||
+    /[\u0000-\u001f\u007f\\%?#]/u.test(base) ||
     base.split('/').some((segment) => segment === '.' || segment === '..')
   ) {
     throw new Error('Asset URL base must be a safe absolute path.');
diff --git a/src/content/schemas.ts b/src/content/schemas.ts
index 9b3385c..36f9198 100644
--- a/src/content/schemas.ts
+++ b/src/content/schemas.ts
@@ -208,8 +208,7 @@ const siteConfigSchema = z.object({
   canonicalUrl: httpUrl,
   buildId: z.string().regex(/^[a-z0-9][a-z0-9._-]{0,127}$/, 'Build ID must be a safe immutable identifier.'),
 }).strict().superRefine((site, context) => {
-  const url = new URL(site.canonicalUrl);
-  if (site.environment === 'preview' && (url.hostname !== 'portfolio.localhost' || url.port || url.pathname !== '/')) {
+  if (site.environment === 'preview' && site.canonicalUrl !== 'https://portfolio.localhost/') {
     context.addIssue({ code: 'custom', message: 'Preview canonical URL must be exactly https://portfolio.localhost/.', path: ['canonicalUrl'] });
   }
   if (site.environment === 'production') {
diff --git a/tests/unit/content-schemas.test.ts b/tests/unit/content-schemas.test.ts
index 2bbcf47..09ef634 100644
--- a/tests/unit/content-schemas.test.ts
+++ b/tests/unit/content-schemas.test.ts
@@ -60,6 +60,17 @@ describe('content schemas', () => {
     })).toThrow(/production hostname is not approved/i);
   });
 
+  it('rejects preview URL normalization aliases instead of accepting their normalized value', () => {
+    for (const canonicalUrl of [
+      'https://portfolio.localhost/.',
+      'https://portfolio.localhost/%2e',
+      'https://portfolio.localhost/?',
+    ]) {
+      expect(() => parseSiteConfig({ environment: 'preview', canonicalUrl, buildId: 'preview-1' }))
+        .toThrow(/exactly https:\/\/portfolio\.localhost\//i);
+    }
+  });
+
   it('rejects controls, non-NFC URLs, and ports at all public URL boundaries', () => {
     expect(() => parseSiteConfig({
       environment: 'preview', canonicalUrl: 'https://portfolio.localhost/\n', buildId: 'preview-1',
diff --git a/tests/unit/production-inputs.test.ts b/tests/unit/production-inputs.test.ts
index e3a7b87..1b5689d 100644
--- a/tests/unit/production-inputs.test.ts
+++ b/tests/unit/production-inputs.test.ts
@@ -80,4 +80,17 @@ describe('production inputs', () => {
       expect(() => assetUrl(manifest, 'selected-build-one', base)).toThrow(/asset url base/i);
     }
   });
+
+  it('rejects raw C0 controls and DEL in an asset URL base before URL parsing', () => {
+    const manifest = parsePublicAssetManifest(JSON.parse(readFileSync(fixtureUrl('asset-manifest.valid.json'), 'utf8')));
+    for (const base of [
+      '/assets/\n../private/',
+      '/assets/\nprivate/',
+      '/assets/\tprivate/',
+      '/assets/\rprivate/',
+      '/assets/\u007fprivate/',
+    ]) {
+      expect(() => assetUrl(manifest, 'selected-build-one', base)).toThrow(/asset url base/i);
+    }
+  });
 });