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Internally found bugs fixed in Thunderbird 154

Exact source revision recorded 23 Oct 2026 15:48:27 UTC. It does not establish the source's current position. Latest evidence.

cve-program · CVE-2026-74989

Published

Internally found bugs present in Thunderbird 153. 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 154 and Thunderbird 154.

Source published
18 Aug 2026 12:23:41 UTC
Source modified
1 Sep 2026 21:25:17 UTC
Observed here
23 Oct 2026 15:48:27 UTC
Source terms
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Sources read 31 Oct 01:21 UTC · 272 of 272 readable · 270 fully read · documentation 469/469 current