CVE-2019-15133: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 1.5% chance of exploitation in the next 30 days.

In GIFLIB before 2019-02-16, a malformed GIF file triggers a divide-by-zero exception in the decoder function DGifSlurp in dgif_lib.c if the height field of the ImageSize data structure is equal to zero.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.04 only
• Debian Debian Linux: version 10.0 only
• Giflib Project Giflib: before 5.1.7 (fixed in 5.1.7)

Published 2019-08-17. Last modified 2026-06-17.