diff --git a/packages/router/src/url_tree.ts b/packages/router/src/url_tree.ts
index 255ed74db9d..6feb42b6d6d 100644
--- a/packages/router/src/url_tree.ts
+++ b/packages/router/src/url_tree.ts
@@ -612,7 +612,13 @@ class UrlParser {
     return this.consumeOptional('#') ? decodeURIComponent(this.remaining) : null;
   }
 
-  private parseChildren(): {[outlet: string]: UrlSegmentGroup} {
+  private parseChildren(depth = 0): {[outlet: string]: UrlSegmentGroup} {
+    if (depth > 50) {
+      throw new RuntimeError(
+        RuntimeErrorCode.UNPARSABLE_URL,
+        (typeof ngDevMode === 'undefined' || ngDevMode) && 'URL is too deep',
+      );
+    }
     if (this.remaining === '') {
       return {};
     }
@@ -632,12 +638,12 @@ class UrlParser {
     let children: {[outlet: string]: UrlSegmentGroup} = {};
     if (this.peekStartsWith('/(')) {
       this.capture('/');
-      children = this.parseParens(true);
+      children = this.parseParens(true, depth);
     }
 
     let res: {[outlet: string]: UrlSegmentGroup} = {};
     if (this.peekStartsWith('(')) {
-      res = this.parseParens(false);
+      res = this.parseParens(false, depth);
     }
 
     if (segments.length > 0 || Object.keys(children).length > 0) {
@@ -723,7 +729,7 @@ class UrlParser {
   }
 
   // parse `(a/b//outlet_name:c/d)`
-  private parseParens(allowPrimary: boolean): {[outlet: string]: UrlSegmentGroup} {
+  private parseParens(allowPrimary: boolean, depth: number): {[outlet: string]: UrlSegmentGroup} {
     const segments: {[key: string]: UrlSegmentGroup} = {};
     this.capture('(');
 
@@ -750,7 +756,7 @@ class UrlParser {
         outletName = PRIMARY_OUTLET;
       }
 
-      const children = this.parseChildren();
+      const children = this.parseChildren(depth + 1);
       segments[outletName ?? PRIMARY_OUTLET] =
         Object.keys(children).length === 1 && children[PRIMARY_OUTLET]
           ? children[PRIMARY_OUTLET]
diff --git a/packages/router/test/url_serializer.spec.ts b/packages/router/test/url_serializer.spec.ts
index 8fc7a432b18..5f467d00bee 100644
--- a/packages/router/test/url_serializer.spec.ts
+++ b/packages/router/test/url_serializer.spec.ts
@@ -425,6 +425,22 @@ describe('url serializer', () => {
     it('should throw when missing closing )', () => {
       expect(() => url.parse('/one/(left')).toThrowError();
     });
+
+    it('should throw when the URL is too deeply nested', () => {
+      let urlStr = 'a';
+      for (let i = 0; i < 60; i++) {
+        urlStr = `p/(${urlStr})`;
+      }
+      expect(() => url.parse(`/${urlStr}`)).toThrowError(/URL is too deep/);
+    });
+
+    it('should not throw when the URL is nested within the limit', () => {
+      let urlStr = 'a';
+      for (let i = 0; i < 40; i++) {
+        urlStr = `p/(${urlStr})`;
+      }
+      expect(() => url.parse(`/${urlStr}`)).not.toThrow();
+    });
   });
 });