Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-74989

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 4.7%
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-74989


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