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

DLA 2837-1: gmp security update

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Debian LTS Advisory DLA-2837-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
December 02, 2021   https://wiki.debian.org/LTS
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Package : gmp
Version : 2:6.1.2+dfsg-1+deb9u1
CVE ID : CVE-2021-43618
Debian Bug : 994405

One security issue has been discovered in gmp: GNU Multiple Precision Arithmetic Library.
It was discovered that integer overflow is possible in mpz/inp_raw.c and
resultant buffer overflow via crafted input, leading to a segmentation fault
on 32-bit platforms.

For Debian 9 stretch, this problem has been fixed in version
2:6.1.2+dfsg-1+deb9u1.

We recommend that you upgrade your gmp packages.

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

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