CVE-2026-6786

Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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...

OESA-2026-1994 thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.CVE-2025-59375 Spoofing issue in Thunderbird. This vulnerability was fixed ...