The php_mysqlnd_read_error_from_line function in the Mysqlnd extension in PHP 5.3 through 5.3.2 does not properly calculate a buffer length, which allows context-dependent attackers to trigger a heap-based buffer overflow via crafted inputs that cause a negative length value to be used.
http://svn.php.net/viewvc?view=revision&revision=298703
http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/NEWS?r1=298701&r2=298703&pathrev=298703
http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html