CVE-2026-74989
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
Internally found bugs present in Thunderbird 153 showed evidence of memory corruption or another security-relevant defect. We presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Thunderbird 154.
Risk Assessment
The bugs could lead to remote code execution or application crashes, potentially exposing users to attacks.
Recommendation
Update Thunderbird to version 154 or later to receive security fixes.
Original NVD description (English source)
Internally found bugs present in 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 and Thunderbird 154.