CVE-2026-8973
High
Description
Memory safety bugs present in Thunderbird 150. 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 151 and Thunderbird 151.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedMay 19, 2026
First seenMay 19, 2026
How to fix
Update
- mozilla firefox151.0.0 or later
- mozilla thunderbird151.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 151.0.0 | 151.0.0 |
| mozilla thunderbird | v < 151.0.0 | 151.0.0 |
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