Mozilla developers and community members reported memory safety bugs present in Firefox 59 and Firefox ESR 52.7. 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.
External Reference:
https://www.mozilla.org/en-US/security/advisories/mfsa2018-12/#CVE-2018-5150
Acknowledgments:
Name: the Mozilla project
Upstream: Christoph Diehl, Randell Jesup, Tyson Smith, Alex Gaynor, Ronald Crane, Julian Hector, Kannan Vijayan, Jason Kratzer