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CVE-2021-38501 Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1

Description

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 93 earliest → < 93 93
Thunderbird 91.2 earliest → < 91.2 91.2
Firefox ESR 91.2 earliest → < 91.2 91.2

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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