CVE-2026-109719
Medium
Description
Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
SeverityMedium
CVSS4.2
Exploit probability—
Product
Firefox
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-362Race conditionCWE-416Use after free
How to fix
Update
- Mozilla Firefox158 or later
- Mozilla Firefox ESR115.43, 153.5 or later
- Mozilla Thunderbird158, 153.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Mozilla Firefox | No range specified | 158 |
| Mozilla Firefox ESR | No range specified | 115.43, 153.5 |
| Mozilla Thunderbird | No range specified | 158, 153.5 |
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