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I recently noticed after performance errors and failure that the memory that a single request was consuming (either front or back) was increased rapidly. After hours of experiments and research I noticed that the option_value record of the "cron" row was 7MB!!!! containing a huge json with a loop of "reschedule" action.

It seems something like an attack and prepare to see it again? How I can protect my site from these cron values?

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You might be suffering from a bug introduced with WordPress 4.3, involving term splitting.

There's a hotfix plugin available here: https://wordpress.org/plugins/wp33423-hotfix/

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why don't you disable wp-cron.php file? Simply paste this code in your wp-config.php file and no scheduled task works after you disable the cron file.

define('DISABLE_WP_CRON', true);
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