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CVE-2020-26974 When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the…

Description

When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

Affected products and versions

Product Affected versions Fixed in
Firefox 84 earliest → < 84 84
Thunderbird 78.6 earliest → < 78.6 78.6
Firefox ESR 78.6 earliest → < 78.6 78.6

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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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