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7.5 High

CVE-2026-84144 Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1

Description

Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 155 earliest → < 155 155
Firefox 153.2 earliest → < 153.2 153.2
Thunderbird 155 earliest → < 155 155
Thunderbird 153.2 earliest → < 153.2 153.2

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