diff --git a/src/Symfony/Component/Security/Core/Encoder/BCryptPasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/BCryptPasswordEncoder.php
index 1b7572d49c..c14cdff50a 100644
--- a/src/Symfony/Component/Security/Core/Encoder/BCryptPasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/BCryptPasswordEncoder.php
@@ -13,6 +13,7 @@ namespace Symfony\Component\Security\Core\Encoder;
 
 use Symfony\Component\Security\Core\Encoder\BasePasswordEncoder;
 use Symfony\Component\Security\Core\Util\SecureRandomInterface;
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
 
 /**
  * @author Elnur Abdurrakhimov <elnur@elnur.pro>
@@ -60,6 +61,10 @@ class BCryptPasswordEncoder extends BasePasswordEncoder
      */
     public function encodePassword($raw, $salt)
     {
+        if ($this->isPasswordTooLong($raw)) {
+            throw new BadCredentialsException('Invalid password.');
+        }
+
         if (function_exists('password_hash')) {
             return password_hash($raw, PASSWORD_BCRYPT, array('cost' => $this->cost));
         }
@@ -78,6 +83,10 @@ class BCryptPasswordEncoder extends BasePasswordEncoder
      */
     public function isPasswordValid($encoded, $raw, $salt)
     {
+        if ($this->isPasswordTooLong($raw)) {
+            return false;
+        }
+
         if (function_exists('password_verify')) {
             return password_verify($raw, $encoded);
         }
diff --git a/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
index c26c9ce5fc..b83eb3050d 100644
--- a/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
@@ -20,6 +20,8 @@ use Symfony\Component\Security\Core\Util\StringUtils;
  */
 abstract class BasePasswordEncoder implements PasswordEncoderInterface
 {
+    const MAX_PASSWORD_LENGTH = 4096;
+
     /**
      * Demerges a merge password and salt string.
      *
@@ -83,4 +85,14 @@ abstract class BasePasswordEncoder implements PasswordEncoderInterface
     {
         return StringUtils::equals($password1, $password2);
     }
+
+    /**
+     * Checks if the password is too long.
+     *
+     * @return Boolean true if the password is too long, false otherwise
+     */
+    protected function isPasswordTooLong($password)
+    {
+        return strlen($password) > self::MAX_PASSWORD_LENGTH;
+    }
 }
diff --git a/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
index a8bd553f78..a7e5546f54 100644
--- a/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/MessageDigestPasswordEncoder.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Encoder;
 
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+
 /**
  * MessageDigestPasswordEncoder uses a message digest algorithm.
  *
@@ -41,6 +43,10 @@ class MessageDigestPasswordEncoder extends BasePasswordEncoder
      */
     public function encodePassword($raw, $salt)
     {
+        if ($this->isPasswordTooLong($raw)) {
+            throw new BadCredentialsException('Invalid password.');
+        }
+
         if (!in_array($this->algorithm, hash_algos(), true)) {
             throw new \LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
         }
@@ -61,6 +67,6 @@ class MessageDigestPasswordEncoder extends BasePasswordEncoder
      */
     public function isPasswordValid($encoded, $raw, $salt)
     {
-        return $this->comparePasswords($encoded, $this->encodePassword($raw, $salt));
+        return !$this->isPasswordTooLong($raw) && $this->comparePasswords($encoded, $this->encodePassword($raw, $salt));
     }
 }
diff --git a/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php
index 656545f2c8..511a16170d 100644
--- a/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/Pbkdf2PasswordEncoder.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Encoder;
 
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+
 /**
  * Pbkdf2PasswordEncoder uses the PBKDF2 (Password-Based Key Derivation Function 2).
  *
@@ -54,6 +56,10 @@ class Pbkdf2PasswordEncoder extends BasePasswordEncoder
      */
     public function encodePassword($raw, $salt)
     {
+        if ($this->isPasswordTooLong($raw)) {
+            throw new BadCredentialsException('Invalid password.');
+        }
+
         if (!in_array($this->algorithm, hash_algos(), true)) {
             throw new \LogicException(sprintf('The algorithm "%s" is not supported.', $this->algorithm));
         }
@@ -72,7 +78,7 @@ class Pbkdf2PasswordEncoder extends BasePasswordEncoder
      */
     public function isPasswordValid($encoded, $raw, $salt)
     {
-        return $this->comparePasswords($encoded, $this->encodePassword($raw, $salt));
+        return !$this->isPasswordTooLong($raw) && $this->comparePasswords($encoded, $this->encodePassword($raw, $salt));
     }
 
     private function hashPbkdf2($algorithm, $password, $salt, $iterations, $length = 0)
diff --git a/src/Symfony/Component/Security/Core/Encoder/PlaintextPasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/PlaintextPasswordEncoder.php
index c21f3cd3f9..22f3da4580 100644
--- a/src/Symfony/Component/Security/Core/Encoder/PlaintextPasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/PlaintextPasswordEncoder.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Security\Core\Encoder;
 
+use Symfony\Component\Security\Core\Exception\BadCredentialsException;
+
 /**
  * PlaintextPasswordEncoder does not do any encoding.
  *
@@ -35,6 +37,10 @@ class PlaintextPasswordEncoder extends BasePasswordEncoder
      */
     public function encodePassword($raw, $salt)
     {
+        if ($this->isPasswordTooLong($raw)) {
+            throw new BadCredentialsException('Invalid password.');
+        }
+
         return $this->mergePasswordAndSalt($raw, $salt);
     }
 
@@ -43,6 +49,10 @@ class PlaintextPasswordEncoder extends BasePasswordEncoder
      */
     public function isPasswordValid($encoded, $raw, $salt)
     {
+        if ($this->isPasswordTooLong($raw)) {
+            return false;
+        }
+
         $pass2 = $this->mergePasswordAndSalt($raw, $salt);
 
         if (!$this->ignorePasswordCase) {
diff --git a/src/Symfony/Component/Security/Tests/Core/Encoder/BCryptPasswordEncoderTest.php b/src/Symfony/Component/Security/Tests/Core/Encoder/BCryptPasswordEncoderTest.php
index bfaf5fcec3..0b368bff9e 100644
--- a/src/Symfony/Component/Security/Tests/Core/Encoder/BCryptPasswordEncoderTest.php
+++ b/src/Symfony/Component/Security/Tests/Core/Encoder/BCryptPasswordEncoderTest.php
@@ -109,4 +109,21 @@ class BCryptPasswordEncoderTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals($expected, $result);
     }
+
+    /**
+     * @expectedException \Symfony\Component\Security\Core\Exception\BadCredentialsException
+     */
+    public function testEncodePasswordLength()
+    {
+        $encoder = new BCryptPasswordEncoder($this->secureRandom, self::VALID_COST);
+
+        $encoder->encodePassword(str_repeat('a', 5000), 'salt');
+    }
+
+    public function testCheckPasswordLength()
+    {
+        $encoder = new BCryptPasswordEncoder($this->secureRandom, self::VALID_COST);
+
+        $this->assertFalse($encoder->isPasswordValid('encoded', str_repeat('a', 5000), 'salt'));
+    }
 }
diff --git a/src/Symfony/Component/Security/Tests/Core/Encoder/BasePasswordEncoderTest.php b/src/Symfony/Component/Security/Tests/Core/Encoder/BasePasswordEncoderTest.php
index 2ef1dcce9e..762f6abca4 100644
--- a/src/Symfony/Component/Security/Tests/Core/Encoder/BasePasswordEncoderTest.php
+++ b/src/Symfony/Component/Security/Tests/Core/Encoder/BasePasswordEncoderTest.php
@@ -53,6 +53,12 @@ class BasePasswordEncoderTest extends \PHPUnit_Framework_TestCase
         $this->invokeMergePasswordAndSalt('password', '{foo}');
     }
 
+    public function testIsPasswordTooLong()
+    {
+        $this->assertTrue($this->invokeIsPasswordTooLong(str_repeat('a', 10000)));
+        $this->assertFalse($this->invokeIsPasswordTooLong(str_repeat('a', 10)));
+    }
+
     protected function invokeDemergePasswordAndSalt($password)
     {
         $encoder = new PasswordEncoder();
@@ -82,4 +88,14 @@ class BasePasswordEncoderTest extends \PHPUnit_Framework_TestCase
 
         return $m->invoke($encoder, $p1, $p2);
     }
+
+    protected function invokeIsPasswordTooLong($p)
+    {
+        $encoder = new PasswordEncoder();
+        $r = new \ReflectionObject($encoder);
+        $m = $r->getMethod('isPasswordTooLong');
+        $m->setAccessible(true);
+
+        return $m->invoke($encoder, $p);
+    }
 }
diff --git a/src/Symfony/Component/Security/Tests/Core/Encoder/MessageDigestPasswordEncoderTest.php b/src/Symfony/Component/Security/Tests/Core/Encoder/MessageDigestPasswordEncoderTest.php
index 64032c4bf9..117b8bac13 100644
--- a/src/Symfony/Component/Security/Tests/Core/Encoder/MessageDigestPasswordEncoderTest.php
+++ b/src/Symfony/Component/Security/Tests/Core/Encoder/MessageDigestPasswordEncoderTest.php
@@ -42,4 +42,21 @@ class MessageDigestPasswordEncoderTest extends \PHPUnit_Framework_TestCase
         $encoder = new MessageDigestPasswordEncoder('foobar');
         $encoder->encodePassword('password', '');
     }
+
+    /**
+     * @expectedException \Symfony\Component\Security\Core\Exception\BadCredentialsException
+     */
+    public function testEncodePasswordLength()
+    {
+        $encoder = new MessageDigestPasswordEncoder();
+
+        $encoder->encodePassword(str_repeat('a', 5000), 'salt');
+    }
+
+    public function testCheckPasswordLength()
+    {
+        $encoder = new MessageDigestPasswordEncoder();
+
+        $this->assertFalse($encoder->isPasswordValid('encoded', str_repeat('a', 5000), 'salt'));
+    }
 }
diff --git a/src/Symfony/Component/Security/Tests/Core/Encoder/Pbkdf2PasswordEncoderTest.php b/src/Symfony/Component/Security/Tests/Core/Encoder/Pbkdf2PasswordEncoderTest.php
index 2c985439f2..e303708fed 100644
--- a/src/Symfony/Component/Security/Tests/Core/Encoder/Pbkdf2PasswordEncoderTest.php
+++ b/src/Symfony/Component/Security/Tests/Core/Encoder/Pbkdf2PasswordEncoderTest.php
@@ -42,4 +42,21 @@ class Pbkdf2PasswordEncoderTest extends \PHPUnit_Framework_TestCase
         $encoder = new Pbkdf2PasswordEncoder('foobar');
         $encoder->encodePassword('password', '');
     }
+
+    /**
+     * @expectedException \Symfony\Component\Security\Core\Exception\BadCredentialsException
+     */
+    public function testEncodePasswordLength()
+    {
+        $encoder = new Pbkdf2PasswordEncoder('foobar');
+
+        $encoder->encodePassword(str_repeat('a', 5000), 'salt');
+    }
+
+    public function testCheckPasswordLength()
+    {
+        $encoder = new Pbkdf2PasswordEncoder('foobar');
+
+        $this->assertFalse($encoder->isPasswordValid('encoded', str_repeat('a', 5000), 'salt'));
+    }
 }
diff --git a/src/Symfony/Component/Security/Tests/Core/Encoder/PlaintextPasswordEncoderTest.php b/src/Symfony/Component/Security/Tests/Core/Encoder/PlaintextPasswordEncoderTest.php
index af0008f927..8b1b888b0c 100644
--- a/src/Symfony/Component/Security/Tests/Core/Encoder/PlaintextPasswordEncoderTest.php
+++ b/src/Symfony/Component/Security/Tests/Core/Encoder/PlaintextPasswordEncoderTest.php
@@ -36,4 +36,21 @@ class PlaintextPasswordEncoderTest extends \PHPUnit_Framework_TestCase
 
         $this->assertSame('foo', $encoder->encodePassword('foo', ''));
     }
+
+    /**
+     * @expectedException \Symfony\Component\Security\Core\Exception\BadCredentialsException
+     */
+    public function testEncodePasswordLength()
+    {
+        $encoder = new PlaintextPasswordEncoder();
+
+        $encoder->encodePassword(str_repeat('a', 5000), 'salt');
+    }
+
+    public function testCheckPasswordLength()
+    {
+        $encoder = new PlaintextPasswordEncoder();
+
+        $this->assertFalse($encoder->isPasswordValid('encoded', str_repeat('a', 5000), 'salt'));
+    }
 }