CVE-2026-74988 — Internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154
Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we pr…
Published: 2026-08-18 · CVSS: 9.8 · CVSS 3.1
Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. 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 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7