Integer Overflow in Firefox Graphics Causes Sandbox Escape

Publication date: 2026-01-13

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description

Sandbox escape due to integer overflow 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:
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Meta Information

Published

2026-01-13

Last Modified

2026-06-30

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-0880

Affected Vendors & Products

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

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is a sandbox escape caused by an integer overflow in the Graphics component of Firefox. It affects Firefox versions prior to 147, Firefox ESR versions prior to 115.32, and Firefox ESR versions prior to 140.7. An integer overflow in this context means that a calculation exceeds the maximum size allowed for an integer, which can lead to unexpected behavior and potentially allow an attacker to break out of the browser's sandbox, gaining unauthorized access or control.

Impact Analysis

This vulnerability can have a high impact as it allows attackers to escape the browser's sandbox, potentially leading to full compromise of the affected system. The CVSS score of 8.8 indicates it can be exploited remotely with low complexity and no privileges required, but user interaction is needed. Successful exploitation can result in complete confidentiality, integrity, and availability loss, meaning attackers could execute arbitrary code, access sensitive information, or disrupt system operations.

Mitigation Strategies

To mitigate this vulnerability, you should 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 integer overflow sandbox escape vulnerability in the Graphics component. [2]

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