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8.8 High

CVE-2026-100831 Use-after-free in the DOM: UI Events & Focus Handling component

Description

Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Affected products and versions

Product Affected versions Fixed in
Firefox 157 earliest → < 157 157
Firefox 153.4 earliest → < 153.4 153.4
Thunderbird 157 earliest → < 157 157
Thunderbird 153.4 earliest → < 153.4 153.4

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-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
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