A screen security update has been released for Debian GNU/Linux 9 LTS to address a security issue that allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted UTF-8 character sequence.

DLA 2570-1: screen security update

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Debian LTS Advisory DLA-2570-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
February 20, 2021   https://wiki.debian.org/LTS
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Package : screen
Version : 4.5.0-6+deb9u1
CVE ID : CVE-2021-26937
Debian Bug : 982435

encoding.c in GNU Screen through 4.8.0 allows remote attackers
to cause a denial of service (invalid write access and application
crash) or possibly have unspecified other impact via a crafted
UTF-8 character sequence.

For Debian 9 stretch, this problem has been fixed in version
4.5.0-6+deb9u1.

We recommend that you upgrade your screen packages.

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

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