Mozilla Foundation Security Advisory 2015-46

Miscellaneous memory safety hazards (rv:38.0 / rv:31.7)

May 12, 2015
Mozilla Developers
Firefox, Firefox ESR, Firefox OS, SeaMonkey, Thunderbird
Fixed in
  • Firefox 38
  • Firefox ESR 31.7
  • Firefox OS 2.2
  • SeaMonkey 2.35
  • Thunderbird 31.7
  • Thunderbird 38.0.1


Mozilla developers and community identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code.

In general these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled, but are potentially a risk in browser or browser-like contexts.


Jesse Ruderman, Mats Palmgren, Byron Campen, and Steve Fink reported memory safety problems and crashes that affect Firefox ESR 31.6 and Firefox 37.

Gary Kwong, Andrew McCreight, Christian Holler, Jesse Ruderman, Mats Palmgren, Jon Coppeard, and Milan Sreckovic reported memory safety problems and crashes that affect Firefox 37.