CVE-2026-92035
Critical
Description
Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Thunderbird 140.17, Firefox 156, Firefox ESR 153.3, Thunderbird 156, Thunderbird 153.3, Firefox ESR 115.42, and Firefox ESR 140.17.
SeverityCritical
CVSS9.6
Exploit probability—
Product
Mozilla Firefox
PublishedSep 15, 2026
First seenSep 15, 2026
Weakness typeCWE-119Memory buffer bounds error
How to fix
Update
- mozilla firefox115.42.0, 140.17.0, 153.3.0, 156.0.0 or later
- mozilla thunderbird140.17.0, 153.3.0, 156.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 115.42.0, 116.0 ≤ v < 140.17.0, 141.0 ≤ v < 153.3.0, 154.0.0 ≤ v < 156.0.0 | 115.42.0, 140.17.0, 153.3.0, 156.0.0 |
| mozilla thunderbird | v < 140.17.0, 141.0 ≤ v < 153.3.0, 154.0 ≤ v < 156.0 | 140.17.0, 153.3.0, 156.0 |
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