Base Encoded Images in HTML breaks Spamspan - site hangs, cron hangs

This issue is the same as reported for the 7.x module.

Any image that's base64 encoded and included in the tag causes spamspan to break pretty badly. It'll cause the server to hang when loading the page, even if it's not published. It'll also cause cron to break and use huge amounts of CPU. On our production server it causes the site to hang and flattens the MySQL instance.

Haven't had a chance to do any further digging, but can confirm removing the offending image returns everything to normal.

N.B. we're using TinyMCE as our editor not CKEditor which has been the problem in previous reports.

I'd suggest that this was a Spamspan issue rather than a WYSIWYG editor, as the editors are saving and displaying the images correctly.