Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Mozilla Firefox affected
Version Status Constraints
140.15 unaffected ≤ 140.*
153.2 unaffected ≤ 153.*
155 unaffected ≤ *
Mozilla Thunderbird affected
Version Status Constraints
140.15 unaffected ≤ 140.*
153.2 unaffected ≤ 153.*
155 unaffected ≤ *

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2059965 cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-82/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-84/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-85/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-86/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-87/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-88/ cve-icon cve-icon
History

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2. Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}

ssvc

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

Tue, 01 Sep 2026 15:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Tue, 01 Sep 2026 13:45:00 +0000

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

Tue, 01 Sep 2026 12:45:00 +0000

Type Values Removed Values Added
Description Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.
Title Use-after-free in the Audio/Video component
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-01T21:44:10.383Z

Reserved: 2026-09-01T07:25:13.250Z

Link: CVE-2026-84122

cve-icon Vulnrichment

Updated: 2026-09-01T15:10:36.559Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-01T13:20:06.040

Modified: 2026-09-01T22:17:14.060

Link: CVE-2026-84122

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T14:45:04Z

Weaknesses