A icu security update has been released for both Debian GNU/Linux 9 and 10 to address an integer overflow in the International Components for Unicode (ICU) library which could result in denial of service and potentially the execution of arbitrary code.

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Debian Security Advisory DSA-4646-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
March 25, 2020   https://www.debian.org/security/faq
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Package : icu
CVE ID : CVE-2020-10531
Debian Bug : 953747

Andre Bargull discovered an integer overflow in the International
Components for Unicode (ICU) library which could result in denial of
service and potentially the execution of arbitrary code.

For the oldstable distribution (stretch), this problem has been fixed
in version 57.1-6+deb9u4.

For the stable distribution (buster), this problem has been fixed in
version 63.1-6+deb10u1.

We recommend that you upgrade your icu packages.

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

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/