CVE-2019-18849: Canonical Ubuntu Linux

Medium severity, CVSS 5.5. EPSS: 1.2% chance of exploitation in the next 30 days.

In tnef before 1.4.18, an attacker may be able to write to the victim's .ssh/authorized_keys file via an e-mail message with a crafted winmail.dat application/ms-tnef attachment, because of a heap-based buffer over-read involving strdup.

Affected products

• Canonical Ubuntu Linux: version 16.04 only
• Debian Debian Linux: version 8.0 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Tnef Project Tnef: before 1.4.18 (fixed in 1.4.18)

Published 2019-11-11. Last modified 2026-06-17.