CVE-2016-6128: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 6.8% chance of exploitation in the next 30 days.

The gdImageCropThreshold function in gd_crop.c in the GD Graphics Library (aka libgd) before 2.2.3, as used in PHP before 7.0.9, allows remote attackers to cause a denial of service (application crash) via an invalid color index.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only; version 16.04 only
• Debian Debian Linux: version 8.0 only
• Libgd Libgd: up to and including 2.2.2
• Opensuse Leap: version 42.1 only

Published 2016-08-07. Last modified 2026-06-17.