CVE-2026-12297

CRITICAL

Sandbox escape due to incorrect boundary conditions in the Networking component

Title source: cna
STIX 2.1

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.

References (25)

Core 25
Core References

Scores

CVSS v3 9.6
EPSS 0.0039
EPSS Percentile 31.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-119 CWE-653
Status published
Products (9)
mozilla/firefox < 115.37.0
mozilla/firefox < 152.0.0
Mozilla/Firefox 115.37 - 115.*
Mozilla/Firefox 140.12 - 140.*
Mozilla/Firefox 152
mozilla/thunderbird < 140.12.0
mozilla/thunderbird < 152.0.0
Mozilla/Thunderbird 140.12 - 140.*
Mozilla/Thunderbird 152
Published Jun 16, 2026
Tracked Since Jun 16, 2026