Use-after-free vulnerability in HTML input element's file picker dialog with webkitdirectory (Firefox < 94, Thunderbird < 91.3, Firefox ESR < 91.3)

CVE-2021-38504 · HIGH Severity

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

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