The remote Debian host is missing a security-related update.
Several vulnerabilities were discovered in Ghostscript, the GPL PostScript/PDF interpreter, which may result in denial of service or the execution of arbitrary code if a malformed Postscript file is processed (despite the -dSAFER sandbox being enabled). This update rebases ghostscript for stretch to the upstream version 9.26 which includes additional changes.
Upgrade the ghostscript packages. For the stable distribution (stretch), these problems have been fixed in version 9.26~dfsg-0+deb9u1.