A qpdf regression update has been released for Debian GNU/Linux 9 Extended LTS to address a regression introduced by the previous update.
ELA-942-2 qpdf regression update
Package : qpdf
Version : 6.0.0-2+deb9u2 (stretch)
Two patches were dropped that caused compatibility issues after backport,
reopening the following CVEs:
CVE-2015-9252, CVE-2017-9209, CVE-2017-11625, CVE-2017-11627