CVE-2026-100794

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Firefox Internationalization Component Boundary Condition Sandbox Escape

Publication date: 2026-09-29

Last updated on: 2026-10-01

Assigner: Mozilla Corporation

Description

Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-29

Last Modified

2026-10-01

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100794

EUVD

EUVD-2026-88946

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	153.4
mozilla	firefox	157
mozilla	firefox	140.17
mozilla	firefox	to 153.4 (inc)
mozilla	firefox	to 140.17 (inc)

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 allows an attacker to escape the sandbox due to incorrect boundary conditions in the Internationalization component of Firefox. It was patched in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.

Detection Guidance

This vulnerability can be detected by checking the installed Firefox version. If your system runs Firefox ESR 153.4 or earlier, Firefox 157 or earlier, or Firefox ESR 140.17 or earlier, it is vulnerable. Use commands like 'firefox --version' or check your package manager for updates.

Impact Analysis

An attacker could exploit this to break out of the sandbox, potentially gaining unauthorized access to system resources or executing arbitrary code on your device.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a sandbox escape due to incorrect boundary conditions in the Internationalization component, which could potentially allow unauthorized access or data exfiltration. However, without additional context on data handling or exposure, its compliance impact remains unclear.

Mitigation Strategies

Update Firefox ESR to version 153.4 or higher, Firefox to version 157 or higher, or Firefox ESR 140.17 or higher to address the sandbox escape vulnerability in the Internationalization component.

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