CVE-2026-84142 — Internally found bugs fixed in Thunderbird 155
Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough eff…
Published: 2026-09-01 · CVSS: 9.8 · CVSS 3.1
Internally found bugs present in Thunderbird 154. 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 155 and Thunderbird 155.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7