A tiff security update has been released for Debian GNU/Linux 9.

DSA 4670-1: tiff security update

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Debian Security Advisory DSA-4670-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 29, 2020   https://www.debian.org/security/faq
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Package : tiff
CVE ID : CVE-2018-12900 CVE-2018-17000 CVE-2018-17100 CVE-2018-19210
CVE-2019-7663 CVE-2019-14973 CVE-2019-17546
Debian Bug : 902718 908778 909038 913675 934780

Several vulnerabilities have been found in the TIFF library, which may
result in denial of service or the execution of arbitrary code if
malformed image files are processed.

For the oldstable distribution (stretch), these problems have been fixed
in version 4.0.8-2+deb9u5.

We recommend that you upgrade your tiff packages.

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

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/