An issue was discovered in QPDF before 7.0.0. There is a large heap-based out-of-bounds read in the PlBuffer::write function in PlBuffer.cc. It is caused by an integer overflow in the PNG filter.
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"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-18185.json"
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