CVE-2026-16411criticalCWE-119

CVE-2026-16411: critical vulnerability in Mozilla Thunderbird

Memory safety bugs fixed in Thunderbird 153

Published 21 Jul 2026 · Updated 21 Oct 2026

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.5%

Memory safety bugs present in Thunderbird 152. 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 153 and Thunderbird 153.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mozilla · Firefox Mozilla · Thunderbird

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References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1420800%2C1598946%2C1767921%2C2013993%2C2025417%2C2027325%2C2027364%2C2029433%2C2029807%2C2029901%2C2029922%2C2030102%2C2030563%2C2032110%2C2037801%2C2042756%2C2044625%2C2045609%2C2047920%2C2048491%2C2048492%2C2048800%2C2050534%2C2050662%2C2050871 https://bugzilla.mozilla.org/buglist.cgi?bug_id=2006467%2C2027346%2C2027349%2C2027353%2C2027362%2C2027371%2C2027373%2C2028954%2C2029694%2C2036906%2C2038964%2C2039460%2C2040522%2C2040834%2C2043275%2C2045394%2C2045606%2C2052060 https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048936%2C2049804 https://www.mozilla.org/security/advisories/mfsa2026-68/https://www.mozilla.org/security/advisories/mfsa2026-71/