diff --git a/src/Symfony/Component/Validator/Mapping/Cache/Psr6Cache.php b/src/Symfony/Component/Validator/Mapping/Cache/Psr6Cache.php
index c0266e65a5..7d1cdd8003 100644
--- a/src/Symfony/Component/Validator/Mapping/Cache/Psr6Cache.php
+++ b/src/Symfony/Component/Validator/Mapping/Cache/Psr6Cache.php
@@ -66,6 +66,11 @@ class Psr6Cache implements CacheInterface
      */
     private function escapeClassName(string $class): string
     {
+        if (false !== strpos($class, '@')) {
+            // anonymous class: replace all PSR6-reserved characters
+            return str_replace(["\0", '\\', '/', '@', ':', '{', '}', '(', ')'], '.', $class);
+        }
+
         return str_replace('\\', '.', $class);
     }
 }
diff --git a/src/Symfony/Component/Validator/Resources/translations/validators.cs.xlf b/src/Symfony/Component/Validator/Resources/translations/validators.cs.xlf
index 4b966698f7..e637d09aa9 100644
--- a/src/Symfony/Component/Validator/Resources/translations/validators.cs.xlf
+++ b/src/Symfony/Component/Validator/Resources/translations/validators.cs.xlf
@@ -318,6 +318,22 @@
                 <source>Error</source>
                 <target>Chyba</target>
             </trans-unit>
+            <trans-unit id="83">
+                <source>This is not a valid UUID.</source>
+                <target>Tato hodnota není platné UUID.</target>
+            </trans-unit>
+            <trans-unit id="84">
+                <source>This value should be a multiple of {{ compared_value }}.</source>
+                <target>Tato hodnota musí být násobek hodnoty {{ compared_value }}.</target>
+            </trans-unit>
+            <trans-unit id="85">
+                <source>This Business Identifier Code (BIC) is not associated with IBAN {{ iban }}.</source>
+                <target>Bankovní identifikační kód (BIC) neodpovídá mezinárodnímu číslu účtu (IBAN) {{ iban }}.</target>
+            </trans-unit>
+            <trans-unit id="86">
+                <source>This value should be valid JSON.</source>
+                <target>Tato hodnota musí být validní JSON.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>
diff --git a/src/Symfony/Component/Validator/Tests/Mapping/Cache/Psr6CacheTest.php b/src/Symfony/Component/Validator/Tests/Mapping/Cache/Psr6CacheTest.php
index c11dddbf6f..fcac5e232a 100644
--- a/src/Symfony/Component/Validator/Tests/Mapping/Cache/Psr6CacheTest.php
+++ b/src/Symfony/Component/Validator/Tests/Mapping/Cache/Psr6CacheTest.php
@@ -23,4 +23,12 @@ class Psr6CacheTest extends AbstractCacheTest
         $this->cache->write($metadata);
         $this->assertFalse($this->cache->has('Foo_Bar'));
     }
+
+    public function testNameWithInvalidChars()
+    {
+        $metadata = new ClassMetadata('class@anonymous/path/file');
+
+        $this->cache->write($metadata);
+        $this->assertTrue($this->cache->has('class@anonymous/path/file'));
+    }
 }