CVE-2017-9058: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

In libytnef in ytnef through 1.9.2, there is a heap-based buffer over-read due to incorrect boundary checking in the SIZECHECK macro in lib/ytnef.c.

Affected products

• Canonical Ubuntu Linux: version 14.04 only
• Ytnef Project Ytnef: up to and including 1.9.2

Published 2017-05-18. Last modified 2026-06-17.