Reset the escaping state when compiling a new template after a compilation error

CHANGELOG

@@ -1,6 +1,7 @@
 # 3.30.1 (2026-XX-XX)
 
  * Reject a deprecated `Template` instance created by another environment in `Environment::resolveTemplate()`
+ * Fix a compilation error inside an `autoescape` tag leaking its escaping strategy into the next compiled template
  * Speed up reading object attributes backed by getters or class constants
  * Fix the sandbox not reporting the line of a rejected `guard` tag
 

src/NodeVisitor/EscaperNodeVisitor.php

@@ -51,12 +51,14 @@ final class EscaperNodeVisitor implements NodeVisitorInterface
     public function enterNode(Node $node, Environment $env): Node
     {
         if ($node instanceof ModuleNode) {
+            $this->defaultStrategy = false;
             if ($env->hasExtension(EscaperExtension::class) && $defaultStrategy = $env->getExtension(EscaperExtension::class)->getDefaultStrategy($node->getTemplateName())) {
                 $this->defaultStrategy = $defaultStrategy;
             }
             $node->setAttribute('strategy', \is_string($this->defaultStrategy) ? $this->defaultStrategy : false);
             $this->safeVars = [];
             $this->blocks = [];
+            $this->statusStack = [];
             $this->usesEscaper = false;
         } elseif ($node instanceof AutoEscapeNode) {
             $this->statusStack[] = $node->getAttribute('value');

tests/NodeVisitor/EscaperTest.php

@@ -14,6 +14,7 @@ namespace Twig\Tests\NodeVisitor;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
+use Twig\Error\Error;
 use Twig\Extension\AbstractExtension;
 use Twig\Loader\ArrayLoader;
 use Twig\Node\Expression\ConstantExpression;
@@ -21,6 +22,7 @@ use Twig\Node\Node;
 use Twig\Node\Nodes;
 use Twig\Node\PrintNode;
 use Twig\NodeVisitor\NodeVisitorInterface;
+use Twig\TwigFilter;
 
 class EscaperTest extends TestCase
 {
@@ -46,6 +48,32 @@ class EscaperTest extends TestCase
         yield 'escaping in an embedded template only' => [false, '{% embed "embedded" %}{% block content %}{{ foo|e }}{% endblock %}{% endembed %}', 1, '<br>'];
     }
 
+    public function testCompilationErrorInsideAnAutoescapeTagDoesNotAffectTheNextTemplate(): void
+    {
+        $env = new Environment(new ArrayLoader([
+            'broken.html' => '{% autoescape false %}{{ foo|failing|nl2br }}{% endautoescape %}',
+            'index.html' => '{{ foo }}',
+            'index.txt' => '{{ foo }}',
+        ]), ['autoescape' => 'name']);
+        $env->addExtension(new class extends AbstractExtension {
+            public function getFilters(): array
+            {
+                return [new TwigFilter('failing', static fn ($value) => $value, ['is_safe_callback' => static function (): array {
+                    throw new \LogicException('Unable to compute the safety of the filter.');
+                }])];
+            }
+        });
+
+        try {
+            $env->load('broken.html');
+            $this->fail('Compiling the template should fail.');
+        } catch (Error) {
+        }
+
+        $this->assertSame('<br>', $env->render('index.txt', ['foo' => '<br>']));
+        $this->assertSame('&lt;br&gt;', $env->render('index.html', ['foo' => '<br>']));
+    }
+
     public function testEscapeFilterAddedByALaterVisitorStillEscapes(): void
     {
         $env = new Environment(new ArrayLoader(['index' => '{{ "<br>" }}']), ['autoescape' => false]);