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.
NOTE: In order to bring this update to effect, you will need to restart your screen session(s).
For Debian 8 jessie, these problems have been fixed in version 4.2.1-3+deb8u2.
We recommend that you upgrade your screen packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/