Several vulnerabilities were discovered in Ghostscript, the GPL PostScript/PDF interpreter, which may result in denial of service if a specially crafted Postscript file is processed.
For the oldstable distribution (jessie), these problems have been fixed in version 9.06~dfsg-2+deb8u6.
For the stable distribution (stretch), these problems have been fixed in version 9.20~dfsg-3.2+deb9u1.
We recommend that you upgrade your ghostscript packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/