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9.8 Critical

CVE-2026-84143 Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14

Description

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. 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 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, 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
Firefox 140.15 earliest → < 140.15 140.15
Thunderbird 155 earliest → < 155 155
Thunderbird 153.2 earliest → < 153.2 153.2
Thunderbird 140.15 earliest → < 140.15 140.15

References

Timeline

  1. Published
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