Ubuntu Security Update USN-7426-2: poppler vulnerabilities

[LinuxBot]

USN-7426-1 fixed several vulnerabilities in poppler. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: It was discovered that poppler incorrectly handled memory when opening certain PDF files. An attacker could possibly use this issue to cause poppler to crash, resulting in a denial of service.

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