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9.8 Critical

CVE-2025-49710 An integer overflow was present in `OrderedHashTable` used by the JavaScript engine

Description

An integer overflow was present in `OrderedHashTable` used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.

Affected products and versions

Product Affected versions Fixed in
Firefox 139.0 earliest → < 139.0.4 139.0.4

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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