diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index 16cf59e8bb2f..e15c89e827a2 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -640,8 +640,11 @@ private function validateAndDenormalizeLegacy(array $types, string $currentClass
     private function validateAndDenormalize(Type $type, string $currentClass, string $attribute, mixed $data, ?string $format, array $context): mixed
     {
         $expectedTypes = [];
+        $isUnionType = $type->asNonNullable() instanceof UnionType;
+        $e = null;
         $extraAttributesException = null;
         $missingConstructorArgumentsException = null;
+        $isNullable = false;
 
         $types = match (true) {
             $type instanceof IntersectionType => throw new LogicException('Unable to handle intersection type.'),
@@ -679,12 +682,19 @@ private function validateAndDenormalize(Type $type, string $currentClass, string
                 // That's why we have to transform the values, if one of these non-string basic datatypes is expected.
                 $typeIdentifier = $t->getTypeIdentifier();
                 if (\is_string($data) && (XmlEncoder::FORMAT === $format || CsvEncoder::FORMAT === $format)) {
+                    if ('' === $data) {
+                        if (TypeIdentifier::ARRAY === $typeIdentifier) {
+                            return [];
+                        }
+
+                        if (TypeIdentifier::STRING === $typeIdentifier) {
+                            return '';
+                        }
+
+                        $isNullable = $isNullable ?: $type->isNullable();
+                    }
+
                     switch ($typeIdentifier) {
-                        case TypeIdentifier::ARRAY:
-                            if ('' === $data) {
-                                return [];
-                            }
-                            break;
                         case TypeIdentifier::BOOL:
                             // according to https://www.w3.org/TR/xmlschema-2/#boolean, valid representations are "false", "true", "0" and "1"
                             if ('false' === $data || '0' === $data) {
@@ -808,17 +818,17 @@ private function validateAndDenormalize(Type $type, string $currentClass, string
                     return $data;
                 }
             } catch (NotNormalizableValueException|InvalidArgumentException $e) {
-                if (!$type instanceof UnionType) {
+                if (!$isUnionType && !$isNullable) {
                     throw $e;
                 }
             } catch (ExtraAttributesException $e) {
-                if (!$type instanceof UnionType) {
+                if (!$isUnionType && !$isNullable) {
                     throw $e;
                 }
 
                 $extraAttributesException ??= $e;
             } catch (MissingConstructorArgumentsException $e) {
-                if (!$type instanceof UnionType) {
+                if (!$isUnionType && !$isNullable) {
                     throw $e;
                 }
 
@@ -838,6 +848,10 @@ private function validateAndDenormalize(Type $type, string $currentClass, string
             throw $missingConstructorArgumentsException;
         }
 
+        if (!$isUnionType && $e) {
+            throw $e;
+        }
+
         if ($context[self::DISABLE_TYPE_ENFORCEMENT] ?? $this->defaultContext[self::DISABLE_TYPE_ENFORCEMENT] ?? false) {
             return $data;
         }
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/NotNormalizableDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/NotNormalizableDummy.php
index 41da0eac8a99..ef7a8c906dc5 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/NotNormalizableDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/NotNormalizableDummy.php
@@ -26,6 +26,6 @@ public function __construct()
 
     public function denormalize(DenormalizerInterface $denormalizer, $data, ?string $format = null, array $context = []): void
     {
-        throw new NotNormalizableValueException();
+        throw new NotNormalizableValueException('Custom exception message');
     }
 }
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
index c5c1f6f0ba01..6f6256506d47 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -946,6 +946,7 @@ public function testDenormalizeUntypedFormat()
     public function testDenormalizeUntypedFormatNotNormalizable()
     {
         $this->expectException(NotNormalizableValueException::class);
+        $this->expectExceptionMessage('Custom exception message');
         $serializer = new Serializer([new CustomNormalizer(), new ObjectNormalizer(null, null, null, new PropertyInfoExtractor([], [new PhpDocExtractor(), new ReflectionExtractor()]))]);
         $serializer->denormalize(['value' => 'test'], DummyWithNotNormalizable::class, 'xml');
     }

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