CVE-2026-16361

Summary

Memory safety bugs present in Thunderbird ESR 140.12. 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 ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.

Impact & exploitability

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

Affected products we track (2)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

• NVD record
• https://www.mozilla.org/security/advisories/mfsa2026-69/Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-70/Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-72/Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029734%2C2036518