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Mozilla Foundation Security Advisory 2008-20

Crash in JavaScript garbage collector

April 16, 2008
Mozilla Developers
Firefox, SeaMonkey
Fixed in
  • Firefox
  • SeaMonkey 1.1.10


Fixes for security problems in the JavaScript engine described in MFSA 2008-15 (CVE-2008-1237) introduced a stability problem, where some users experienced crashes during JavaScript garbage collection. This is being fixed primarily to address stability concerns. We have no demonstration that this particular crash is exploitable but are issuing this advisory because some crashes of this type have been shown to be exploitable in the past.

This regression was introduced in Firefox and does not affect any shipping version of Thunderbird. Thunderbird contains the correct fix for MFSA 2008-15, although as noted in that advisory Thunderbird users would be vulnerable only if they had enabled JavaScript.


Disable JavaScript until a version containing these fixes can be installed.