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CVE-2026-109705

CRITICAL NVD
CVSS Score
9.6
Severity
CRITICAL
Source
NVD
Published
Oct 13, 2026
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.

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