Another Ghostscript update has been released for Debian GNU/Linux 9 to address a regression introduced by the previous update

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Debian Security Advisory DSA-4346-2 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
December 23, 2018 https://www.debian.org/security/faq
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Package : ghostscript
Debian Bug : 915832

The update for ghostscript issued as DSA-4346-1 caused a regression when
used with certain options (cf. Debian bug #915832). Updated packages are
now available to correct this issue.

For the stable distribution (stretch), this problem has been fixed in
version 9.26~dfsg-0+deb9u2.

We recommend that you upgrade your ghostscript packages.

For the detailed security status of ghostscript please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/ghostscript

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/

  Ghostscript Regression Update for Debian 9