CVE-2026-8974

Description

Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

PUBLISHED Reserved 2026-05-19 | Published 2026-05-19 | Updated 2026-05-20 | Assigner mozilla

Product status

Credits

Nika Layzell, Randell Jesup, Timothy Nikkel, Tom Schuster and the Mozilla Fuzzing Team

References

bugzilla.mozilla.org/...035966%2C2036668%2C2036905%2C2036930 (Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151)

www.mozilla.org/security/advisories/mfsa2026-46/

www.mozilla.org/security/advisories/mfsa2026-48/

www.mozilla.org/security/advisories/mfsa2026-50/

www.mozilla.org/security/advisories/mfsa2026-51/

cve.org (CVE-2026-8974)

nvd.nist.gov (CVE-2026-8974)

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