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CVE-2021-38504 When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have…

Description

When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Affected products and versions

Product Affected versions Fixed in
Firefox 94 earliest → < 94 94
Thunderbird 91.3 earliest → < 91.3 91.3
Firefox ESR 91.3 earliest → < 91.3 91.3

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High
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