Security researcher Alex Chapman reported that the Almost
Native Graphics Layer Engine (ANGLE) library used by Mozilla is vulnerable to an
integer overflow. This vulnerability is present because of insufficient bounds
checking in the drawLineLoop function, which can be driven by web
content to overflow allocated memory, leading to a potentially exploitable
crash.
In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.
Vulmon