diff --git a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/RequestPayloadValueResolver.php b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/RequestPayloadValueResolver.php
index efa78dfb05878..7ffd2e5f577a5 100644
--- a/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/RequestPayloadValueResolver.php
+++ b/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/RequestPayloadValueResolver.php
@@ -24,6 +24,7 @@
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\Serializer\Exception\NotEncodableValueException;
 use Symfony\Component\Serializer\Exception\PartialDenormalizationException;
+use Symfony\Component\Serializer\Exception\UnexpectedPropertyException;
 use Symfony\Component\Serializer\Exception\UnsupportedFormatException;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\SerializerInterface;
@@ -35,6 +36,7 @@
 
 /**
  * @author Konstantin Myakshin <molodchick@gmail.com>
+ * @author Aurélien Pillevesse <aurelienpillevesse@hotmail.fr>
  *
  * @final
  */
@@ -197,6 +199,8 @@ private function mapRequestPayload(Request $request, string $type, MapRequestPay
             throw new UnsupportedMediaTypeHttpException(sprintf('Unsupported format: "%s".', $format), $e);
         } catch (NotEncodableValueException $e) {
             throw new BadRequestHttpException(sprintf('Request payload contains invalid "%s" data.', $format), $e);
+        } catch (UnexpectedPropertyException $e) {
+            throw new BadRequestHttpException(sprintf('Request payload contains invalid "%s" property.', $e->property), $e);
         }
     }
 }
diff --git a/src/Symfony/Component/Serializer/Exception/UnexpectedPropertyException.php b/src/Symfony/Component/Serializer/Exception/UnexpectedPropertyException.php
new file mode 100644
index 0000000000000..4f9ead9a64c30
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Exception/UnexpectedPropertyException.php
@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * UnexpectedPropertyException.
+ *
+ * @author Aurélien Pillevesse <aurelienpillevesse@hotmail.fr>
+ */
+class UnexpectedPropertyException extends \UnexpectedValueException implements ExceptionInterface
+{
+    public function __construct(
+        public readonly string $property,
+        ?\Throwable $previous = null,
+    ) {
+        $msg = sprintf('Property is not allowed ("%s" is unknown).', $this->property);
+
+        parent::__construct($msg, 0, $previous);
+    }
+}
diff --git a/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php b/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php
index a7b450fd27a34..8c0b53157f4cd 100644
--- a/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php
+++ b/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php
@@ -11,13 +11,21 @@
 
 namespace Symfony\Component\Serializer\NameConverter;
 
+use Symfony\Component\Serializer\Exception\UnexpectedPropertyException;
+
 /**
  * CamelCase to Underscore name converter.
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
+ * @author Aurélien Pillevesse <aurelienpillevesse@hotmail.fr>
  */
-class CamelCaseToSnakeCaseNameConverter implements NameConverterInterface
+class CamelCaseToSnakeCaseNameConverter implements AdvancedNameConverterInterface
 {
+    /**
+     * Require all properties to be written in snake_case.
+     */
+    public const REQUIRE_SNAKE_CASE_PROPERTIES = 'require_snake_case_properties';
+
     /**
      * @param array|null $attributes     The list of attributes to rename or null for all attributes
      * @param bool       $lowerCamelCase Use lowerCamelCase style
@@ -28,7 +36,7 @@ public function __construct(
     ) {
     }
 
-    public function normalize(string $propertyName): string
+    public function normalize(string $propertyName, ?string $class = null, ?string $format = null, array $context = []): string
     {
         if (null === $this->attributes || \in_array($propertyName, $this->attributes, true)) {
             return strtolower(preg_replace('/[A-Z]/', '_\\0', lcfirst($propertyName)));
@@ -37,8 +45,12 @@ public function normalize(string $propertyName): string
         return $propertyName;
     }
 
-    public function denormalize(string $propertyName): string
+    public function denormalize(string $propertyName, ?string $class = null, ?string $format = null, array $context = []): string
     {
+        if (($context[self::REQUIRE_SNAKE_CASE_PROPERTIES] ?? false) && $propertyName !== $this->normalize($propertyName, $class, $format, $context)) {
+            throw new UnexpectedPropertyException($propertyName);
+        }
+
         $camelCasedName = preg_replace_callback('/(^|_|\.)+(.)/', fn ($match) => ('.' === $match[1] ? '_' : '').strtoupper($match[2]), $propertyName);
 
         if ($this->lowerCamelCase) {
diff --git a/src/Symfony/Component/Serializer/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php b/src/Symfony/Component/Serializer/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php
index e4d419e454f16..f9d941890f1c8 100644
--- a/src/Symfony/Component/Serializer/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php
+++ b/src/Symfony/Component/Serializer/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php
@@ -12,11 +12,13 @@
 namespace Symfony\Component\Serializer\Tests\NameConverter;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\Exception\UnexpectedPropertyException;
 use Symfony\Component\Serializer\NameConverter\CamelCaseToSnakeCaseNameConverter;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
+ * @author Aurélien Pillevesse <aurelienpillevesse@hotmail.fr>
  */
 class CamelCaseToSnakeCaseNameConverterTest extends TestCase
 {
@@ -55,4 +57,20 @@ public static function attributeProvider()
             ['this_is_a_test', 'ThisIsATest', false],
         ];
     }
+
+    public function testDenormalizeWithContext()
+    {
+        $nameConverter = new CamelCaseToSnakeCaseNameConverter(null, true);
+        $denormalizedValue = $nameConverter->denormalize('last_name', context: [CamelCaseToSnakeCaseNameConverter::REQUIRE_SNAKE_CASE_PROPERTIES]);
+
+        $this->assertSame($denormalizedValue, 'lastName');
+    }
+
+    public function testErrorDenormalizeWithContext()
+    {
+        $nameConverter = new CamelCaseToSnakeCaseNameConverter(null, true);
+
+        $this->expectException(UnexpectedPropertyException::class);
+        $nameConverter->denormalize('lastName', context: [CamelCaseToSnakeCaseNameConverter::REQUIRE_SNAKE_CASE_PROPERTIES => true]);
+    }
 }