CVE-2019-18634: Debian Linux

High severity, CVSS 7.8. EPSS: 19.3% chance of exploitation in the next 30 days.

In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Sudo Project Sudo: from 1.7.1, before 1.8.26 (fixed in 1.8.26)

Published 2020-01-29. Last modified 2026-06-17.