diff --git a/changelog/GHSA-4rmg-292m-wg3w.md b/changelog/GHSA-4rmg-292m-wg3w.md
new file mode 100644
index 00000000..cd15f3e6
--- /dev/null
+++ b/changelog/GHSA-4rmg-292m-wg3w.md
@@ -0,0 +1 @@
+- Fixed a code injection vulnerability in extends-tag. This addresses CVE-2024-35226.
diff --git a/libs/sysplugins/smarty_internal_compile_extends.php b/libs/sysplugins/smarty_internal_compile_extends.php
index d72d2b76..69a7b552 100644
--- a/libs/sysplugins/smarty_internal_compile_extends.php
+++ b/libs/sysplugins/smarty_internal_compile_extends.php
@@ -30,7 +30,7 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inh
      *
      * @var array
      */
-    public $optional_attributes = array('extends_resource');
+    public $optional_attributes = array();
 
     /**
      * Attribute definition: Overwrites base class.
@@ -62,29 +62,7 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inh
         }
         // add code to initialize inheritance
         $this->registerInit($compiler, true);
-        $file = trim($_attr[ 'file' ], '\'"');
-        if (strlen($file) > 8 && substr($file, 0, 8) === 'extends:') {
-            // generate code for each template
-            $files = array_reverse(explode('|', substr($file, 8)));
-            $i = 0;
-            foreach ($files as $file) {
-                if ($file[ 0 ] === '"') {
-                    $file = trim($file, '".');
-                } else {
-                    $file = "'{$file}'";
-                }
-                $i++;
-                if ($i === count($files) && isset($_attr[ 'extends_resource' ])) {
-                    $this->compileEndChild($compiler);
-                }
-                $this->compileInclude($compiler, $file);
-            }
-            if (!isset($_attr[ 'extends_resource' ])) {
-                $this->compileEndChild($compiler);
-            }
-        } else {
-            $this->compileEndChild($compiler, $_attr[ 'file' ]);
-        }
+        $this->compileEndChild($compiler, $_attr[ 'file' ]);
         $compiler->has_code = false;
         return '';
     }
@@ -115,44 +93,4 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inh
                 '') . ");\n?>"
         );
     }
-
-    /**
-     * Add code for including subtemplate to end of template
-     *
-     * @param \Smarty_Internal_TemplateCompilerBase $compiler
-     * @param string                                $template subtemplate name
-     *
-     * @throws \SmartyCompilerException
-     * @throws \SmartyException
-     */
-    private function compileInclude(Smarty_Internal_TemplateCompilerBase $compiler, $template)
-    {
-        $compiler->parser->template_postfix[] = new Smarty_Internal_ParseTree_Tag(
-            $compiler->parser,
-            $compiler->compileTag(
-                'include',
-                array(
-                    $template,
-                    array('scope' => 'parent')
-                )
-            )
-        );
-    }
-
-    /**
-     * Create source code for {extends} from source components array
-     *
-     * @param \Smarty_Internal_Template $template
-     *
-     * @return string
-     */
-    public static function extendsSourceArrayCode(Smarty_Internal_Template $template)
-    {
-        $resources = array();
-        foreach ($template->source->components as $source) {
-            $resources[] = $source->resource;
-        }
-        return $template->smarty->left_delimiter . 'extends file=\'extends:' . join('|', $resources) .
-               '\' extends_resource=true' . $template->smarty->right_delimiter;
-    }
 }
diff --git a/libs/sysplugins/smarty_internal_templatecompilerbase.php b/libs/sysplugins/smarty_internal_templatecompilerbase.php
index f5d2c438..8ff3e052 100644
--- a/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -455,15 +455,29 @@ abstract class Smarty_Internal_TemplateCompilerBase
             $this->smarty->_current_file = $this->template->source->filepath;
             // get template source
             if (!empty($this->template->source->components)) {
-                // we have array of inheritance templates by extends: resource
-                // generate corresponding source code sequence
-                $_content =
-                    Smarty_Internal_Compile_Extends::extendsSourceArrayCode($this->template);
+				$_compiled_code = '<?php $_smarty_tpl->_loadInheritance(); $_smarty_tpl->inheritance->init($_smarty_tpl, true); ?>';
+
+				$i = 0;
+				$reversed_components = array_reverse($this->template->getSource()->components);
+				foreach ($reversed_components as $source) {
+					$i++;
+					if ($i === count($reversed_components)) {
+						$_compiled_code .= '<?php $_smarty_tpl->inheritance->endChild($_smarty_tpl); ?>';
+					}
+					$_compiled_code .= $this->compileTag(
+						'include',
+						[
+							var_export($source->resource, true),
+							['scope' => 'parent'],
+						]
+					);
+				}
+				$_compiled_code = $this->postFilter($_compiled_code, $this->template);
             } else {
                 // get template source
                 $_content = $this->template->source->getContent();
+				$_compiled_code = $this->postFilter($this->doCompile($this->preFilter($_content), true));
             }
-            $_compiled_code = $this->postFilter($this->doCompile($this->preFilter($_content), true));
             if (!empty($this->required_plugins[ 'compiled' ]) || !empty($this->required_plugins[ 'nocache' ])) {
                 $_compiled_code = '<?php ' . $this->compileRequiredPlugins() . "?>\n" . $_compiled_code;
             }
diff --git a/tests/UnitTests/TemplateSource/TagTests/BockExtend/CompileBlockExtendsTest.php b/tests/UnitTests/TemplateSource/TagTests/BockExtend/CompileBlockExtendsTest.php
index b14eab67..91908deb 100644
--- a/tests/UnitTests/TemplateSource/TagTests/BockExtend/CompileBlockExtendsTest.php
+++ b/tests/UnitTests/TemplateSource/TagTests/BockExtend/CompileBlockExtendsTest.php
@@ -1371,8 +1371,38 @@ class CompileBlockExtendsTest extends PHPUnit_Smarty
         );
     }
 
-	public function testBlockWithAssign() {
-		$this->assertEquals('Captured content is: Content with lots of html here', $this->smarty->fetch('038_child.tpl'));
-	}
+    public function testBlockWithAssign() {
+        $this->assertEquals('Captured content is: Content with lots of html here', $this->smarty->fetch('038_child.tpl'));
+    }
+
+    /**
+     * Test escaping of file parameter
+     */
+    public function testEscaping()
+    {
+        $this->expectException(SmartyException::class);
+        $this->expectExceptionMessageRegExp('/Unable to load.*/');
+        $this->assertEquals('hello world', $this->smarty->fetch('escaping.tpl'));
+    }
+
+    /**
+     * Test escaping of file parameter 2
+     */
+    public function testEscaping2()
+    {
+        $this->expectException(SmartyException::class);
+        $this->expectExceptionMessageRegExp('/Unable to load.*/');
+        $this->assertEquals('hello world', $this->smarty->fetch('escaping2.tpl'));
+    }
+
+    /**
+     * Test escaping of file parameter 3
+     */
+    public function testEscaping3()
+    {
+        $this->expectException(SmartyException::class);
+        $this->expectExceptionMessageRegExp('/Unable to load.*/');
+        $this->assertEquals('hello world', $this->smarty->fetch('escaping3.tpl'));
+    }
 
 }
diff --git a/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping.tpl b/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping.tpl
new file mode 100644
index 00000000..74540365
--- /dev/null
+++ b/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping.tpl
@@ -0,0 +1 @@
+{extends "extends:helloworld.tpl', var_dump(shell_exec('ls')), 1, 2, 3, 4, 5, 6);}}?>"}
\ No newline at end of file
diff --git a/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping2.tpl b/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping2.tpl
new file mode 100644
index 00000000..4ad9c13b
--- /dev/null
+++ b/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping2.tpl
@@ -0,0 +1 @@
+{extends 'extends:"helloworld.tpl\', var_dump(shell_exec(\'ls\')), 1, 2, 3, 4, 5, 6);}}?>'}
\ No newline at end of file
diff --git a/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping3.tpl b/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping3.tpl
new file mode 100644
index 00000000..8c13ebd2
--- /dev/null
+++ b/tests/UnitTests/TemplateSource/TagTests/BockExtend/templates/escaping3.tpl
@@ -0,0 +1 @@
+{extends file='extends:"helloworld.tpl'|cat:"', var_dump(shell_exec('ls')), 1, 2, 3, 4, 5, 6);}}?>"}
\ No newline at end of file
diff --git a/tests/UnitTests/TemplateSource/TagTests/Include/CompileIncludeTest.php b/tests/UnitTests/TemplateSource/TagTests/Include/CompileIncludeTest.php
index c9b1c154..4b5c5243 100644
--- a/tests/UnitTests/TemplateSource/TagTests/Include/CompileIncludeTest.php
+++ b/tests/UnitTests/TemplateSource/TagTests/Include/CompileIncludeTest.php
@@ -82,6 +82,18 @@ class CompileIncludeTest extends PHPUnit_Smarty
         $this->assertEquals('I1I2I3', $content, $text);
     }
 
+    /**
+     * test template name escaping
+     */
+    public function testIncludeFilenameEscaping()
+    {
+        $this->expectException(SmartyException::class);
+        $this->expectExceptionMessageRegExp('/Unable to load.*/');
+        $tpl = $this->smarty->createTemplate('test_include_security.tpl');
+        $content = $this->smarty->fetch($tpl);
+        $this->assertEquals("hello world", $content);
+    }
+
     /**
      * test standard output
      *
diff --git a/tests/UnitTests/TemplateSource/TagTests/Include/templates/test_include_security.tpl b/tests/UnitTests/TemplateSource/TagTests/Include/templates/test_include_security.tpl
new file mode 100644
index 00000000..4e449d85
--- /dev/null
+++ b/tests/UnitTests/TemplateSource/TagTests/Include/templates/test_include_security.tpl
@@ -0,0 +1 @@
+{include file="helloworld.tpl', var_dump(shell_exec('ls')), 1, 2, 3, 4, 5, 6);}}?>"}
diff --git a/tests/UnitTests/TemplateSource/_Issues/419/ExtendsIssue419Test.php b/tests/UnitTests/TemplateSource/_Issues/419/ExtendsIssue419Test.php
index 5ea20027..322322d7 100644
--- a/tests/UnitTests/TemplateSource/_Issues/419/ExtendsIssue419Test.php
+++ b/tests/UnitTests/TemplateSource/_Issues/419/ExtendsIssue419Test.php
@@ -32,4 +32,11 @@ class ExtendsIssue419Test extends PHPUnit_Smarty
         $this->assertEquals('child', $this->smarty->fetch('extends:001_parent.tpl|001_child.tpl'));
     }
 
+    public function testextendsSecurity()
+    {
+        $this->expectException(SmartyException::class);
+        $this->expectExceptionMessageRegExp('/Unable to load.*/');
+        $this->assertEquals('child', $this->smarty->fetch('string:{include "001_parent.tpl\', var_dump(shell_exec(\'ls\')), 1, 2, 3, 4, 5, 6);}}?>"}'));
+    }
+
 }