CVE-2017-5436: Debian Linux

High severity, CVSS 8.8. EPSS: 2.4% chance of exploitation in the next 30 days.

An out-of-bounds write in the Graphite 2 library triggered with a maliciously crafted Graphite font. This results in a potentially exploitable crash. This issue was fixed in the Graphite 2 library as well as Mozilla products. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Affected products

• Debian Debian Linux: version 8.0 only
• Mozilla Firefox: before 45.9.0 (fixed in 45.9.0); before 53.0 (fixed in 53.0); version 52.0 only
• Mozilla Thunderbird: before 52.1.0 (fixed in 52.1.0)
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only
• Red Hat Enterprise Linux Desktop: version 6.0 only; version 7.0 only
• Red Hat Enterprise Linux Server: version 6.0 only; version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.3 only; version 7.4 only
• Red Hat Enterprise Linux Server Eus: version 7.3 only; version 7.4 only; version 7.5 only
• Red Hat Enterprise Linux Workstation: version 6.0 only; version 7.0 only
• Sil GRAPHITE2: affected versions not specified

Published 2018-06-11. Last modified 2026-06-17.