Updated poppler packages has been released for Debian 7

Package : poppler
Version : 0.18.4-6+deb7u1
CVE ID : CVE-2015-8868
Debian Bug : 822578

A heap buffer overflow vulnerability was found in the poppler library. A
maliciously crafted file could cause the application to crash. The issue
happens when "ExtGState" is not a valid blend mode.