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6.5 Medium

CVE-2026-74976 JIT miscompilation in the JavaScript Engine: JIT component

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Affected products and versions

Product Affected versions Fixed in
Firefox 154 earliest → < 154 154
Firefox 153.1 earliest → < 153.1 153.1
Firefox 140.14 earliest → < 140.14 140.14
Thunderbird 154 earliest → < 154 154
Thunderbird 153.1 earliest → < 153.1 153.1
Thunderbird 140.14 earliest → < 140.14 140.14

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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