diff --git a/src/wp-includes/html-api/class-wp-html-tag-processor.php b/src/wp-includes/html-api/class-wp-html-tag-processor.php
index 5e2ee114ae9e6..7a53fbea1e273 100644
--- a/src/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/src/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -1431,8 +1431,15 @@ private function skip_script_data(): bool {
 				continue;
 			}
 
-			// Everything of interest past here starts with "<".
-			if ( $at + 1 >= $doc_length || '<' !== $html[ $at++ ] ) {
+			if ( $at + 1 >= $doc_length ) {
+				return false;
+			}
+
+			/*
+			 * Everything of interest past here starts with "<".
+			 * Check this character and advance position regardless.
+			 */
+			if ( '<' !== $html[ $at++ ] ) {
 				continue;
 			}
 
diff --git a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
index fceaaddb04af6..637aa38751688 100644
--- a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
@@ -2875,4 +2875,32 @@ public function insert_after( $new_html ) {
 			'Should have properly applied the update from in front of the cursor.'
 		);
 	}
+
+	/**
+	 * Test an infinite loop bugfix in incomplete script tag parsing.
+	 *
+	 * @small
+	 *
+	 * @ticket 61810
+	 */
+	public function test_script_tag_processing_no_infinite_loop_final_dash() {
+		$processor = new WP_HTML_Tag_Processor( '<script>-' );
+
+		$this->assertFalse( $processor->next_tag() );
+		$this->assertTrue( $processor->paused_at_incomplete_token() );
+	}
+
+	/**
+	 * Test an infinite loop bugfix in incomplete script tag parsing.
+	 *
+	 * @small
+	 *
+	 * @ticket 61810
+	 */
+	public function test_script_tag_processing_no_infinite_loop_final_left_angle_bracket() {
+		$processor = new WP_HTML_Tag_Processor( '<script><' );
+
+		$this->assertFalse( $processor->next_tag() );
+		$this->assertTrue( $processor->paused_at_incomplete_token() );
+	}
 }