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6.5 Medium

CVE-2025-9181 Uninitialized memory in the JavaScript Engine component

Description

Uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 142, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 142 earliest → < 142 142
Firefox 140.2 earliest → < 140.2 140.2
Firefox 128.14 earliest → < 128.14 128.14
Firefox ESR 140.2 earliest → < 140.2 140.2
Thunderbird 142 earliest → < 142 142
Thunderbird 140.2 earliest → < 140.2 140.2
Thunderbird 128.14 earliest → < 128.14 128.14

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-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High
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