CVE-2026-4710
Critical
Description
Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Mozilla Firefox
PublishedMar 24, 2026
First seenMar 24, 2026
Weakness typeCWE-119Memory buffer bounds error
How to fix
Update
- mozilla firefox140.9.0, 149.0 or later
- mozilla thunderbird140.9.0, 149.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 140.9.0, v < 149.0 | 140.9.0, 149.0 |
| mozilla thunderbird | v < 140.9.0, v < 149.0 | 140.9.0, 149.0 |
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