CVE-2018-5248: Canonical Ubuntu Linux

High severity, CVSS 8.8. EPSS: 3.5% chance of exploitation in the next 30 days.

In ImageMagick 7.0.7-17 Q16, there is a heap-based buffer over-read in coders/sixel.c in the ReadSIXELImage function, related to the sixel_decode function.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only; version 18.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• ImageMagick ImageMagick: version 7.0.7-17 only

Published 2018-01-05. Last modified 2026-06-17.