CVE-2016-4356: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

The append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.3 allows remote attackers to cause a denial of service (out-of-bounds read) by clearing the high bit of the byte after invalid utf-8 encoded data.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only
• Gnupg Libksba: up to and including 1.3.2

Published 2016-06-13. Last modified 2026-06-17.