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5.4 Medium

CVE-2026-84118 Use-after-free in the JavaScript: GC component

Description

Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 155 earliest → < 155 155
Firefox 153.2 earliest → < 153.2 153.2
Thunderbird 155 earliest → < 155 155
Thunderbird 153.2 earliest → < 153.2 153.2

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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