CVE-2026-109712

Deferred Deferred - Pending Action

Sandbox Escape in Firefox Due to Uninitialized Memory

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Mozilla Corporation

Description

Sandbox escape due to uninitialized memory in the Graphics component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-13

EPSS Evaluated

2026-10-18

NVD

CVE-2026-109712

EUVD

EUVD-2026-98637

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	158
mozilla	firefox_esr	115.43
mozilla	firefox_esr	153.5

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-908	The product uses or accesses a resource that has not been initialized.

Attack-Flow Graph

Executive Summary

This vulnerability is a sandbox escape caused by uninitialized memory in the Graphics component of Firefox. It allows an attacker to break out of the browser's sandbox and potentially execute arbitrary code on the host system.

Detection Guidance

This vulnerability is a sandbox escape due to uninitialized memory in Firefox's Graphics component. To detect it, check your Firefox version against the fixed versions (Firefox 158, Firefox ESR 115.43, or Firefox ESR 153.5). Run 'firefox --version' in the terminal to check your version. If your version is older, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain control over your system by escaping the browser sandbox. This could lead to data theft, malware installation, or further network compromise.

Compliance Impact

This vulnerability does not directly impact compliance with GDPR or HIPAA as it is a sandbox escape issue in the Graphics component. Compliance depends on broader security controls and data protection measures rather than this specific vulnerability.

Mitigation Strategies

Update Firefox to version 158 or later, Firefox ESR to version 115.43 or later, or Firefox ESR to version 153.5 or later to patch the vulnerability.

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