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8.8 High

CVE-2026-92021 Use-after-free in the JavaScript Engine: JIT component

Description

Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 140.16 and Thunderbird 140.16.

Affected products and versions

Product Affected versions Fixed in
Firefox 140.16 earliest → < 140.16 140.16
Thunderbird 140.16 earliest → < 140.16 140.16

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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