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CVE-2020-26959 During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a…

Description

During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Affected products and versions

Product Affected versions Fixed in
Firefox 83 earliest → < 83 83
Firefox ESR 78.5 earliest → < 78.5 78.5
Thunderbird 78.5 earliest → < 78.5 78.5

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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