CVE-2019-11707
Mozilla: Type confusion in Array.pop
Severity
CriticalRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · June 19, 2019
Updated · January 9, 2026
Description
A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.
Statement
In general, this flaw cannot be exploited through email in Thunderbird because scripting is disabled when reading mail.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 8.8CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')