CVE-2026-12297
9.6
CRITICAL
CVSS 3.1
Description
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
How to fix CVE-2026-12297
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/firefox-esr—no fix listed
- Debian/thunderbird—no fix listed
Is CVE-2026-12297 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-12297.
Affected packages (2)
- from 0
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| nvd | CVSS 3.1 | CRITICAL9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |