An unbound1.9 security update has been released for Debian GNU/Linux 9 LTS to address several security vulnerabilities.

DLA 2652-1: unbound1.9 security update

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Debian LTS Advisory DLA-2652-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
May 06, 2021   https://wiki.debian.org/LTS
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Package : unbound1.9
Version : 1.9.0-2+deb10u2~deb9u2
CVE ID : CVE-2019-25031 CVE-2019-25032 CVE-2019-25033 CVE-2019-25034
CVE-2019-25035 CVE-2019-25036 CVE-2019-25037 CVE-2019-25038
CVE-2019-25039 CVE-2019-25040 CVE-2019-25041 CVE-2019-25042

Several security vulnerabilities have been discovered in Unbound, a validating,
recursive, caching DNS resolver, by security researchers of X41 D-SEC located
in Aachen, Germany. Integer overflows, assertion failures, an out-of-bound
write and an infinite loop vulnerability may lead to a denial-of-service or
have a negative impact on data confidentiality.

For Debian 9 stretch, these problems have been fixed in version
1.9.0-2+deb10u2~deb9u2.

We recommend that you upgrade your unbound1.9 packages.

For the detailed security status of unbound1.9 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/unbound1.9

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS