CVE-2017-18185
An issue was discovered in QPDF before 7.0.0. There is a large heap-based out-of-bounds read in the Pl_Buffer::write function in Pl_Buffer.cc. It is caused by an integer overflow in the PNG filter.
Date published : 2018-02-13
https://github.com/qpdf/qpdf/commit/ec7d74a386c0b2f38990079c3b0d2a2b30be0e71