CVE-2026-2807
Critical
Description
Memory safety bugs present in Firefox 147 and Thunderbird 147. 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 148 and Thunderbird 148.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Mozilla Firefox
PublishedFeb 24, 2026
First seenFeb 24, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- mozilla firefox148.0 or later
- mozilla thunderbird148.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 148.0 | 148.0 |
| mozilla thunderbird | v < 148.0 | 148.0 |
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