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5.4 Medium

CVE-2026-12330 Incorrect boundary conditions in the Internationalization component

Description

Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.

Affected products and versions

Product Affected versions Fixed in
Firefox 140.12 earliest → < 140.12 140.12
Firefox 115.37 earliest → < 115.37 115.37
Thunderbird 140.12 earliest → < 140.12 140.12

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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