diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
index 9286dd0890de2..8072319b5eaf7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -6,6 +6,7 @@ CHANGELOG
 
  * Add native return type to `Translator` and to `Application::reset()`
  * Deprecate the integration of Doctrine annotations, either uninstall the `doctrine/annotations` package or disable the integration by setting `framework.annotations` to `false`
+ * Enable `json_decode_detailed_errors` context for Serializer by default if `kernel.debug` is true and the `seld/jsonlint` package is installed
 
 6.3
 ---
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index e1063b37eccba..0e277cf2cdc46 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -14,6 +14,7 @@
 use Doctrine\Common\Annotations\Annotation;
 use Doctrine\DBAL\Connection;
 use Psr\Log\LogLevel;
+use Seld\JsonLint\JsonParser;
 use Symfony\Bundle\FullStack;
 use Symfony\Component\Asset\Package;
 use Symfony\Component\AssetMapper\AssetMapper;
@@ -41,6 +42,7 @@
 use Symfony\Component\RemoteEvent\RemoteEvent;
 use Symfony\Component\Scheduler\Schedule;
 use Symfony\Component\Semaphore\Semaphore;
+use Symfony\Component\Serializer\Encoder\JsonDecode;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Translation\Translator;
 use Symfony\Component\Uid\Factory\UuidFactory;
@@ -1123,6 +1125,10 @@ private function addSerializerSection(ArrayNodeDefinition $rootNode, callable $e
                         ->arrayNode('default_context')
                             ->normalizeKeys(false)
                             ->useAttributeAsKey('name')
+                            ->beforeNormalization()
+                                ->ifTrue(fn () => $this->debug && class_exists(JsonParser::class))
+                                ->then(fn (array $v) => $v + [JsonDecode::DETAILED_ERROR_MESSAGES => true])
+                            ->end()
                             ->defaultValue([])
                             ->prototype('variable')->end()
                         ->end()
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
index e3ecd982d3cc8..7dee7fc5c0ef1 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
@@ -27,6 +27,7 @@
 use Symfony\Component\Notifier\Notifier;
 use Symfony\Component\RateLimiter\Policy\TokenBucketLimiter;
 use Symfony\Component\Scheduler\Messenger\SchedulerTransportFactory;
+use Symfony\Component\Serializer\Encoder\JsonDecode;
 use Symfony\Component\Uid\Factory\UuidFactory;
 
 class ConfigurationTest extends TestCase
@@ -34,7 +35,7 @@ class ConfigurationTest extends TestCase
     public function testDefaultConfig()
     {
         $processor = new Processor();
-        $config = $processor->processConfiguration(new Configuration(true), [['http_method_override' => false, 'secret' => 's3cr3t']]);
+        $config = $processor->processConfiguration(new Configuration(true), [['http_method_override' => false, 'secret' => 's3cr3t', 'serializer' => ['default_context' => ['foo' => 'bar']]]]);
 
         $this->assertEquals(self::getBundleDefaultConfig(), $config);
     }
@@ -563,8 +564,8 @@ protected static function getBundleDefaultConfig()
                 'enabled' => true,
             ],
             'serializer' => [
-                'default_context' => [],
-                'enabled' => !class_exists(FullStack::class),
+                'default_context' => ['foo' => 'bar', JsonDecode::DETAILED_ERROR_MESSAGES => true],
+                'enabled' => true,
                 'enable_annotations' => !class_exists(FullStack::class),
                 'mapping' => ['paths' => []],
             ],
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 1a27839a47186..2a33d8751a088 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -35,6 +35,7 @@
     "require-dev": {
         "doctrine/annotations": "^1.13.1|^2",
         "doctrine/persistence": "^1.3|^2|^3",
+        "seld/jsonlint": "^1.10",
         "symfony/asset": "^5.4|^6.0|^7.0",
         "symfony/asset-mapper": "^6.3|^7.0",
         "symfony/browser-kit": "^5.4|^6.0|^7.0",
@@ -58,7 +59,7 @@
         "symfony/scheduler": "^6.3|^7.0",
         "symfony/security-bundle": "^5.4|^6.0|^7.0",
         "symfony/semaphore": "^5.4|^6.0|^7.0",
-        "symfony/serializer": "^6.3|^7.0",
+        "symfony/serializer": "^6.4|^7.0",
         "symfony/stopwatch": "^5.4|^6.0|^7.0",
         "symfony/string": "^5.4|^6.0|^7.0",
         "symfony/translation": "^6.2.8|^7.0",
@@ -90,7 +91,7 @@
         "symfony/mime": "<6.2",
         "symfony/property-info": "<5.4",
         "symfony/property-access": "<5.4",
-        "symfony/serializer": "<6.3",
+        "symfony/serializer": "<6.4",
         "symfony/security-csrf": "<5.4",
         "symfony/security-core": "<5.4",
         "symfony/stopwatch": "<5.4",