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CVE-2017-5401 A crash triggerable by web content in which an "ErrorResult" references unassigned memory due to a logic error

Description

A crash triggerable by web content in which an "ErrorResult" references unassigned memory due to a logic error. The resulting crash may be exploitable. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

Affected products and versions

Product Affected versions Fixed in
Firefox 52 earliest → < 52 52
Firefox ESR 45.8 earliest → < 45.8 45.8
Thunderbird 52 earliest → < 52 52
Thunderbird 45.8 earliest → < 45.8 45.8

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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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