If you haven't already disabled all the ghostscript codecs in policy.xml, now would be a good time to double check.https://twitter.com/wdormann/status/857217642377216000 …
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Is it really a new issue (it really looks like CVE-2016-7976), maybe Ubuntu forgot to patch? 
didn't dig into it, but that CVE was published tonight. ghostscript + -dSAFER + that tweet caught my eye
I took a look, it's actually quite a clever exploit. Don't know how I missed that .rsdparams bug, I reported several identical ones. Doh!
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