Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.
Advisories

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Fixes

Solution

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Workaround

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History

Tue, 13 Jan 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

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


Tue, 13 Jan 2026 14:00:00 +0000

Type Values Removed Values Added
Description Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.
Title Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-01-13T14:33:38.952Z

Reserved: 2026-01-13T13:30:59.286Z

Link: CVE-2026-0891

cve-icon Vulnrichment

Updated: 2026-01-13T14:33:02.676Z

cve-icon NVD

Status : Received

Published: 2026-01-13T14:16:39.627

Modified: 2026-01-13T15:16:00.760

Link: CVE-2026-0891

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses