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CVE-2023-4577 When `UpdateRegExpStatics` attempted to access `initialStringHeap` it could already have been garbage collected prior to…

Description

When `UpdateRegExpStatics` attempted to access `initialStringHeap` it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 117 earliest → < 117 117
Firefox ESR 115.2 earliest → < 115.2 115.2
Thunderbird 115.2 earliest → < 115.2 115.2

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