Skip to content
Sign in
Not rated

CVE-2021-23960 Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially…

Description

Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, 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

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
Track this CVE