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CVE-2023-5171 During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker…

Description

During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NUL bytes, and cause a potentially exploitable crash. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

Affected products and versions

Product Affected versions Fixed in
Firefox 118 earliest → < 118 118
Firefox ESR 115.3 earliest → < 115.3 115.3
Thunderbird 115.3 earliest → < 115.3 115.3

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-2026-118024 Use-after-free in the Graphics: Text component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High
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