CVE-2026-0879

CRITICAL

Firefox < 115.32.0, 140.7-140.*, <147.0, >=147 - Sandbox Escape via Graphics Component Boundary Condition

Title source: llm
STIX 2.1

Description

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

References (6)

Core 6

Scores

CVSS v3 9.8
EPSS 0.0003
EPSS Percentile 9.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-119
Status published
Products (9)
mozilla/firefox < 115.32.0
mozilla/firefox < 147.0
Mozilla/Firefox 115.32 - 115.*
Mozilla/Firefox 140.7 - 140.*
Mozilla/Firefox 147
mozilla/thunderbird < 140.7.0
mozilla/thunderbird < 147.0
Mozilla/Thunderbird 140.7 - 140.*
Mozilla/Thunderbird 147
Published Jan 13, 2026
Tracked Since Feb 18, 2026