Debian Linux Security Advisory 4712-1 - Handling problems and cases of missing or incomplete input sanitising may result in denial of service, memory disclosure or potentially the execution of arbitrary code if malformed image files are processed.
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Ubuntu Security Notice 4192-1 - It was discovered that ImageMagick incorrectly handled certain malformed image files. If a user or automated system using ImageMagick were tricked into opening a specially crafted image, an attacker could exploit this to cause a denial of service or possibly execute code with the privileges of the user invoking the program.
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