CVE-2026-92061

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Security Sandbox Escape in Firefox

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92061

EUVD

EUVD-2026-78524

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 156.0.0 (exc)
mozilla	thunderbird	to 156.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

This vulnerability involves incorrect boundary conditions in the Security: Process Sandboxing component of Firefox. It was addressed in Firefox version 156.

Detection Guidance

This vulnerability is specific to Firefox versions before 156. To detect it, check your Firefox version by running 'firefox --version' or 'about:support' in the browser. If the version is below 156, the system is vulnerable.

Impact Analysis

The vulnerability could allow unauthorized access or execution of malicious code within the sandboxed environment, potentially compromising user data or system integrity.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions incorrect boundary conditions in the Security: Process Sandboxing component of Firefox, fixed in version 156.

Mitigation Strategies

Update Firefox to version 156 or later to address the incorrect boundary conditions in the Security: Process Sandboxing component.

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