Jon, severity in launchpad is mostly unused. (Maybe some teams use it
but I'm not aware of them.) Issues that the Ubuntu Security Team tracks
are on the Ubuntu CVE Tracker:

https://people.canonical.com/~ubuntu-security/cve/pkg/imagemagick.html

Now the bad news -- I don't think the upstream developers have
understood the issues and prepared meaningful patches. My full critique
is at http://www.openwall.com/lists/oss-security/2016/05/03/19 .

Ideally the upstream authors will create patches that do address my
concerns (and the concerns raised by the mail.ru security team privately
with the upstream authors).

There's some suggestions here for mitigations: https://imagetragick.com/

I recommend testing these mitigations in your environment. I also
recommend using AppArmor to confine services that allow users to provide
images for ImageMagick manipulation.

Thanks

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https://bugs.launchpad.net/bugs/1578398

Title:
  ImageMagick Security Issue reported yesterday

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