CVE-2018-12406: Canonical Ubuntu Linux

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Mozilla developers and community members reported memory safety bugs present in Firefox 63. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 64.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Mozilla Firefox: before 64.0 (fixed in 64.0)

Published 2019-02-28. Last modified 2026-06-17.