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CVE-2026-84121

nvd nist
Published: Sep 1, 2026Modified: Sep 2, 2026

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9.6
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Exploitability: 2.8 / Impact: 6.0
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Affected (7)

Mozilla
2 products
Firefox
Thunderbird
Configuration A
7 vulnerable
Vulnerable SoftwareAffected Versions
Mozilla
Firefox
Before 115.40.0
Firefox
From 116.0 to 140.15.0
Firefox
From 141.0.0 to 153.2.0
Firefox
From 154.0.0 to 155.0.0
Mozilla
Thunderbird
Before 140.15.0
Thunderbird
From 141.0 to 153.2.0
Thunderbird
From 154.0 to 155.0

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (8)

Source: security@mozilla.org
Permissions Required
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory

Timeline

No history available yet.