CVE-2026-100758
Received Received - Intake

DOM Navigation Sandbox Escape in Firefox

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100758
EUVD
EUVD-2026-88910

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 115.42
mozilla firefox 140.17

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a sandbox escape vulnerability in Firefox's DOM Navigation component. It allows malicious code to break out of the browser's security sandbox, potentially gaining unauthorized access to system resources or other browser processes.

Detection Guidance

Detection requires checking Firefox version against patched releases. Use commands like 'firefox --version' or check package managers (e.g., 'apt list --installed | grep firefox' for Debian/Ubuntu). Compare versions against Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code on your system, steal sensitive data, install malware, or perform other malicious actions through a compromised browser session.

Compliance Impact

This vulnerability is a sandbox escape in the DOM Navigation component, which could allow unauthorized access to sensitive data or system resources. Such an issue may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by enabling data breaches or unauthorized access to protected information.

Mitigation Strategies

Update Firefox to the latest patched version immediately. For ESR users, upgrade to Firefox ESR 153.4 or 115.42. For standard releases, upgrade to Firefox 157 or ESR 140.17. Disable automatic updates temporarily if needed until patches are applied.

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