9.6
Critical
CVE-2026-100786 Sandbox escape due to use-after-free in the Graphics component
Description
Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 157 | earliest → < 157 | 157 |
| Firefox 153.4 | earliest → < 153.4 | 153.4 |
| Firefox 140.17 | earliest → < 140.17 | 140.17 |
| Firefox 115.42 | earliest → < 115.42 | 115.42 |
| Thunderbird 157 | earliest → < 157 | 157 |
| Thunderbird 153.4 | earliest → < 153.4 | 153.4 |
| Thunderbird 140.17 | earliest → < 140.17 | 140.17 |
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