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CRITICALCVE-2026-0879Published Modified CNA mozilla

CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component

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.

Metrics

CVSS v3.1
9.8
Severity
CRITICAL
Fixed in
115.32
Affected Products
2

Fix available

115.32140.7147
Affected packages
  • Mozilla / Firefox
    Fixed in 115.32, 140.7, 147
  • Mozilla / Thunderbird
    Fixed in 140.7, 147
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component | HarborGuard CVE