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CVE-2020-26973 Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed

Description

Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. 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

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-2026-118026 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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