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8.8 High

CVE-2024-7527 Unexpected marking work at the start of sweeping could have led to a use-after-free

Description

Unexpected marking work at the start of sweeping could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

Affected products and versions

Product Affected versions Fixed in
Firefox 129 earliest → < 129 129
Firefox ESR 128.1 earliest → < 128.1 128.1
Thunderbird 115.14 earliest → < 115.14 115.14
firefox_esr 128.1 earliest → < 128.1 128.1
firefox_esr 115.14 earliest → < 115.14 115.14

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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