[DependencyInjection] Escape parameters before resolving env placeholders

Author: MatTheCat

ContainerBuilder.php

@@ -777,7 +777,7 @@ public function compile(bool $resolveEnvPlaceholders = false)
 
         if ($bag instanceof EnvPlaceholderParameterBag) {
             if ($resolveEnvPlaceholders) {
-                $this->parameterBag = new ParameterBag($this->resolveEnvPlaceholders($bag->all(), true));
+                $this->parameterBag = new ParameterBag($this->resolveEnvPlaceholders($this->escapeParameters($bag->all()), true));
             }
 
             $this->envPlaceholders = $bag->getEnvPlaceholders();
@@ -1728,4 +1728,18 @@ private function inVendors(string $path): bool
 
         return $this->pathsInVendor[$path] = false;
     }
+
+    private function escapeParameters(array $parameters): array
+    {
+        $params = [];
+        foreach ($parameters as $k => $v) {
+            $params[$k] = match (true) {
+                \is_array($v) => $this->escapeParameters($v),
+                \is_string($v) => str_replace('%', '%%', $v),
+                default => $v,
+            };
+        }
+
+        return $params;
+    }
 }

Tests/ContainerBuilderTest.php

@@ -884,6 +884,7 @@ public function testCompileWithResolveEnv()
         $container->setParameter('bar', '%% %env(DUMMY_ENV_VAR)% %env(DUMMY_SERVER_VAR)% %env(HTTP_DUMMY_VAR)%');
         $container->setParameter('foo', '%env(FOO)%');
         $container->setParameter('baz', '%foo%');
+        $container->setParameter('qux', '%%quux%%');
         $container->setParameter('env(HTTP_DUMMY_VAR)', '123');
         $container->register('teatime', 'stdClass')
             ->setProperty('foo', '%env(DUMMY_ENV_VAR)%')
@@ -1128,7 +1129,7 @@ public function testAddObjectResource()
 
         $this->assertCount(1, $resources);
 
-        /** @var \Symfony\Component\Config\Resource\FileResource $resource */
+        /** @var FileResource $resource */
         $resource = end($resources);
 
         $this->assertInstanceOf(FileResource::class, $resource);