CVE-2026-0879
Unknown Unknown - Not Provided
Sandbox Escape in Firefox Graphics Component Before

Publication date: 2026-01-13

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-01-13
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-14
NVD
CVE-2026-0879
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 147 (exc)
mozilla firefox_esr to 115.32 (exc)
mozilla firefox_esr to 140.7 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a sandbox escape caused by incorrect boundary conditions in the Graphics component of Firefox. It affects versions of Firefox before 147, Firefox ESR before 115.32, and Firefox ESR before 140.7.

Impact Analysis

The vulnerability can lead to a sandbox escape, which means an attacker could potentially execute code outside the restricted environment, leading to full compromise of confidentiality, integrity, and availability of the affected system.

Mitigation Strategies

To mitigate this vulnerability, immediately update Firefox to version 147 or later, or Firefox ESR to version 115.32 or later, including ESR 140.7 or later. These versions include fixes that address the sandbox escape due to incorrect boundary conditions in the Graphics component.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-0879. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart