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8.8 High

CVE-2026-8974 Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150

Description

Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Affected products and versions

Product Affected versions Fixed in
Firefox 151 earliest → < 151 151
Firefox 140.11 earliest → < 140.11 140.11
Thunderbird 151 earliest → < 151 151
Thunderbird 140.11 earliest → < 140.11 140.11

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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