CVE-2018-16749: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 2.3% chance of exploitation in the next 30 days.

In ImageMagick 7.0.7-29 and earlier, a missing NULL check in ReadOneJNGImage in coders/png.c allows an attacker to cause a denial of service (WriteBlob assertion failure and application exit) via a crafted file.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• ImageMagick ImageMagick: before 6.9.9-42 (fixed in 6.9.9-42); from 7.0.0-0, up to and including 7.0.7-29

Published 2018-09-09. Last modified 2026-06-17.