CVE-2026-109705
CRITICAL
CVSS 9.6
Published: 2026-10-13
Modified: 2026-10-13
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Description
Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Quick Facts
| CVE ID | CVE-2026-109705 |
| CVSS Score | 9.6 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| Published | 2026-10-13 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |