CVE-2016-1960: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 30.9% chance of exploitation in the next 30 days.

Integer underflow in the nsHtml5TreeBuilder class in the HTML5 string parser in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) by leveraging mishandling of end tags, as demonstrated by incorrect SVG processing, aka ZDI-CAN-3545.

Affected products

• Mozilla Firefox: up to and including 44.0.2; version 38.0 only; version 38.0.1 only; version 38.0.5 only; version 38.1.0 only; version 38.1.1 only; …
• Mozilla Thunderbird: up to and including 38.6.0
• Opensuse Leap: version 42.1 only
• Opensuse Opensuse: version 13.1 only; version 13.2 only
• Oracle Linux: version 5.0 only; version 6 only; version 7 only
• Suse Linux Enterprise: version 12.0 only

Published 2016-03-13. Last modified 2026-06-17.