CVE-2020-9366: GNU Screen

Critical severity, CVSS 9.8. EPSS: 2.7% chance of exploitation in the next 30 days.

A buffer overflow was found in the way GNU Screen before 4.8.0 treated the special escape OSC 49. Specially crafted output, or a special program, could corrupt memory and crash Screen or possibly have unspecified other impact.

Affected products

• GNU Screen: before 4.8.0 (fixed in 4.8.0)

Published 2020-02-24. Last modified 2026-06-17.