diff --git a/src/Symfony/Component/Validator/Constraints/Schema.php b/src/Symfony/Component/Validator/Constraints/Schema.php
new file mode 100644
index 0000000000000..2d51ba61146d6
--- /dev/null
+++ b/src/Symfony/Component/Validator/Constraints/Schema.php
@@ -0,0 +1,74 @@
+<?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\Validator\Constraints;
+
+use Symfony\Component\Validator\Attribute\HasNamedArguments;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\InvalidArgumentException;
+use Symfony\Component\Validator\Exception\LogicException;
+use Symfony\Component\Yaml\Parser;
+
+/**
+ * @author Benjamin Georgeault <bgeorgeault@wedgesama.fr>
+ */
+#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class Schema extends Composite
+{
+    public const JSON = 'JSON';
+    public const YAML = 'YAML';
+
+    public const INVALID_ERROR = 'f8925b90-edfd-4364-a17a-f34a60f24b26';
+
+    public string $format;
+
+    protected const ERROR_NAMES = [
+        self::INVALID_ERROR => 'INVALID_ERROR',
+    ];
+
+    private static array $allowedTypes = [
+        self::JSON,
+        self::YAML,
+    ];
+
+    /**
+     * @param array<Constraint>|Constraint $constraints
+     */
+    #[HasNamedArguments]
+    public function __construct(
+        string $format,
+        public array|Constraint $constraints = [],
+        public ?string $invalidMessage = 'Cannot apply schema validation, this value does not respect format.',
+        ?array $groups = null,
+        mixed $payload = null,
+        public int $flags = 0,
+        public ?int $depth = null,
+    ) {
+        $this->format = $format = strtoupper($format);
+
+        if (!\in_array($format, static::$allowedTypes)) {
+            throw new InvalidArgumentException(\sprintf('The "format" parameter value is not valid. It must contain one or more of the following values: "%s".', implode(', ', self::$allowedTypes)));
+        }
+
+        if (self::YAML === $format && !class_exists(Parser::class)) {
+            throw new LogicException('The Yaml component is required to use the Yaml constraint. Try running "composer require symfony/yaml".');
+        }
+
+        parent::__construct([
+            'constraints' => $constraints,
+        ], $groups, $payload);
+    }
+
+    protected function getCompositeOption(): string
+    {
+        return 'constraints';
+    }
+}
diff --git a/src/Symfony/Component/Validator/Constraints/SchemaValidator.php b/src/Symfony/Component/Validator/Constraints/SchemaValidator.php
new file mode 100644
index 0000000000000..33fb486aa9301
--- /dev/null
+++ b/src/Symfony/Component/Validator/Constraints/SchemaValidator.php
@@ -0,0 +1,87 @@
+<?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\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+use Symfony\Component\Validator\Exception\ValidatorException;
+use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Parser;
+
+/**
+ * @author Benjamin Georgeault <bgeorgeault@wedgesama.fr>
+ */
+class SchemaValidator extends ConstraintValidator
+{
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof Schema) {
+            throw new UnexpectedTypeException($constraint, Schema::class);
+        }
+
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        if (!\is_scalar($value) && !$value instanceof \Stringable) {
+            throw new UnexpectedValueException($value, 'string');
+        }
+
+        $value = (string) $value;
+
+        try {
+            $data = match ($constraint->format) {
+                Schema::YAML => $this->validateAndGetYaml($value, $constraint),
+                Schema::JSON => $this->validateAndGetJson($value, $constraint),
+            };
+        } catch (ValidatorException $e) {
+            $this->context->buildViolation($constraint->invalidMessage)
+                ->setParameter('{{ error }}', $e->getMessage())
+                ->setParameter('{{ format }}', $constraint->format)
+                ->setCode(Schema::INVALID_ERROR)
+                ->addViolation();
+
+            return;
+        }
+
+        if (empty($constraint->constraints)) {
+            return;
+        }
+
+        $validator = ($context = $this->context)
+            ->getValidator()->inContext($context);
+
+        $validator->validate($data, $constraint->constraints);
+    }
+
+    private function validateAndGetYaml(string $value, Schema $constraint): mixed
+    {
+        try {
+            return (new Parser())->parse($value, $constraint->flags);
+        } catch (ParseException $e) {
+            throw new ValidatorException(\sprintf('Invalid YAML with message "%s".', $e->getMessage()));
+        } finally {
+            restore_error_handler();
+        }
+    }
+
+    private function validateAndGetJson(string $value, Schema $constraint): mixed
+    {
+        if (!json_validate($value, $constraint->depth ?? 512, $constraint->flags)) {
+            throw new ValidatorException('Invalid JSON.');
+        }
+
+        return json_decode($value, true, $constraint->depth ?? 512, $constraint->flags);
+    }
+}
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/SchemaTest.php b/src/Symfony/Component/Validator/Tests/Constraints/SchemaTest.php
new file mode 100644
index 0000000000000..497f909d695ff
--- /dev/null
+++ b/src/Symfony/Component/Validator/Tests/Constraints/SchemaTest.php
@@ -0,0 +1,40 @@
+<?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\Validator\Tests\Constraints;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Validator\Constraints\Schema;
+
+class SchemaTest extends TestCase
+{
+    public function testEmptyFieldsInOptions()
+    {
+        $constraint = new Schema(
+            format: 'YAML',
+            invalidMessage: 'fooo',
+        );
+
+        $this->assertSame([], $constraint->constraints);
+        $this->assertSame('YAML', $constraint->format);
+        $this->assertSame('fooo', $constraint->invalidMessage);
+        $this->assertSame(0, $constraint->flags);
+    }
+
+    public function testUpperFormat()
+    {
+        $constraint = new Schema(
+            format: 'yaml',
+        );
+
+        $this->assertSame('YAML', $constraint->format);
+    }
+}
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/SchemaValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/SchemaValidatorTest.php
new file mode 100644
index 0000000000000..e96245a4124c0
--- /dev/null
+++ b/src/Symfony/Component/Validator/Tests/Constraints/SchemaValidatorTest.php
@@ -0,0 +1,76 @@
+<?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\Validator\Tests\Constraints;
+
+use Symfony\Component\Validator\Constraints\NotNull;
+use Symfony\Component\Validator\Constraints\Schema;
+use Symfony\Component\Validator\Constraints\SchemaValidator;
+use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
+
+class SchemaValidatorTest extends ConstraintValidatorTestCase
+{
+    protected function createValidator(): SchemaValidator
+    {
+        return new SchemaValidator();
+    }
+
+    /**
+     * @dataProvider getValidValues
+     */
+    public function testFormatIsValid(string $format, string $value)
+    {
+        $this->validator->validate($value, new Schema($format));
+
+        $this->assertNoViolation();
+    }
+
+    /**
+     * @dataProvider getInvalidValues
+     */
+    public function testFormatIsInvalid(string $format, string $value, string $errorMsg)
+    {
+        $this->validator->validate($value, new Schema($format));
+
+        $this->buildViolation('Cannot apply schema validation, this value does not respect format.')
+            ->setParameter('{{ error }}', $errorMsg)
+            ->setParameter('{{ format }}', $format)
+            ->setCode(Schema::INVALID_ERROR)
+            ->assertRaised();
+    }
+
+    public function testValidWithConstraint()
+    {
+        $constraint = new Schema(
+            format: 'yaml',
+            constraints: new NotNull(),
+        );
+
+        $this->validator->validate('foo: "bar"', $constraint);
+        $this->assertNoViolation();
+    }
+
+    public static function getValidValues(): array
+    {
+        return [
+            ['yaml', 'foo: "bar"'],
+            ['json', '{"foo":"bar"}'],
+        ];
+    }
+
+    public static function getInvalidValues(): array
+    {
+        return [
+            ['YAML', 'foo: ["bar"', 'Invalid YAML with message "Malformed inline YAML string at line 1 (near "foo: ["bar"").".'],
+            ['JSON', '{"foo:"bar"}', 'Invalid JSON.'],
+        ];
+    }
+}