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CVE-2021-23954 Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion,…

Description

Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

Affected products and versions

Product Affected versions Fixed in
Firefox 85 earliest → < 85 85
Thunderbird 78.7 earliest → < 78.7 78.7
Firefox ESR 78.7 earliest → < 78.7 78.7

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