Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4836-1 firefox-esr security update
Debian DLA Debian DLA DLA-4863-1 thunderbird security update
Debian DSA Debian DSA DSA-6560-1 firefox-esr security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 27 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 27 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
References

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

Type Values Removed Values Added
Description Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free 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 16:15:00 +0000

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

Tue, 13 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
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'}


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

Type Values Removed Values Added
Description Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
Title Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-27T14:05:57.372Z

Reserved: 2026-10-13T00:29:14.767Z

Link: CVE-2026-109705

cve-icon Vulnrichment

Updated: 2026-10-13T14:16:41.369Z

cve-icon NVD

Status : Deferred

Published: 2026-10-13T13:17:20.587

Modified: 2026-10-27T14:16:32.530

Link: CVE-2026-109705

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T01:30:14Z

Weaknesses