A flaw was found in ImageMagick, where an integer overflow in WriteTHUMBNAILImage of coders/thumbnail.c may trigger undefined behavior via a crafted image file that is submitted by an attacker and processed by an application using ImageMagick. This could lead to a denial-of-service.
For Debian 8 jessie, these problems have been fixed in version 8:184.108.40.206-5+deb8u24.
We recommend that you upgrade your imagemagick packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/