Description
Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
Published: 2026-09-01
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 04 Sep 2026 09:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 03 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125
CWE-787

Thu, 03 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird

Thu, 03 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Wed, 02 Sep 2026 08:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125
CWE-787

Wed, 02 Sep 2026 06:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-416

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

Type Values Removed Values Added
Description Internally found bugs present in Firefox 154 and Firefox ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2. Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
Title Internally found bugs fixed in Firefox 155 and Firefox ESR 153.2 Internally found bugs fixed in Thunderbird 155 and Thunderbird ESR 153.2
References

Tue, 01 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119
CWE-416

Tue, 01 Sep 2026 14:15:00 +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 Internally found bugs present in Firefox 154 and Firefox ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.
Title Internally found bugs fixed in Firefox 155 and Firefox ESR 153.2
References

Subscriptions

Mozilla Firefox Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-03T15:41:26.571Z

Reserved: 2026-09-01T07:26:01.858Z

Link: CVE-2026-84144

cve-icon Vulnrichment

Updated: 2026-09-03T15:41:15.829Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-01T13:20:08.563

Modified: 2026-09-03T16:33:15.953

Link: CVE-2026-84144

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T21:30:06Z

Weaknesses