CVE-2021-26937: Debian Linux

Critical severity, CVSS 9.8. EPSS: 9.1% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 32 only; version 33 only
• GNU Screen: up to and including 4.8.0

Published 2021-02-09. Last modified 2026-06-17.