9.6
Critical
CVE-2026-12294 Sandbox escape in the DOM: Workers component
Description
Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 152 | earliest → < 152 | 152 |
| Firefox 140.12 | earliest → < 140.12 | 140.12 |
| Firefox 115.37 | earliest → < 115.37 | 115.37 |
| Thunderbird 152 | earliest → < 152 | 152 |
| Thunderbird 140.12 | earliest → < 140.12 | 140.12 |
| Red Hat Enterprise Linux AppStream (v. 10) | Versions not published | |
| Red Hat Enterprise Linux AppStream (v. 8) | Versions not published | |
| Red Hat Enterprise Linux AppStream (v. 9) | Versions not published | |
| Red Hat Enterprise Linux 10 | Versions not published |