Description
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Published: 2026-10-13
Score: 9.6 Critical
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No solution or workaround provided in the CVE record.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4836-1 firefox-esr security update
Debian DSA Debian DSA DSA-6560-1 firefox-esr security update
History

Thu, 15 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-122

Tue, 13 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
References

Tue, 13 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 13 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-122

Tue, 13 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
Description Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
Title Sandbox escape due to incorrect boundary conditions in the Networking component
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-15T19:52:39.911Z

Reserved: 2026-10-13T00:29:17.366Z

Link: CVE-2026-109708

cve-icon Vulnrichment

Updated: 2026-10-15T19:52:32.087Z

cve-icon NVD

Status : Deferred

Published: 2026-10-13T13:17:20.910

Modified: 2026-10-15T20:17:07.163

Link: CVE-2026-109708

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T21:15:16Z

Weaknesses