Description
Internally found bugs present in Thunderbird 154. 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 Thunderbird 155.
Published: 2026-09-01
Score: 9.8 Critical
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

Thu, 03 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
CWE-787

Thu, 03 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 03 Sep 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
Weaknesses CWE-119
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Wed, 02 Sep 2026 06:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
CWE-787

Wed, 02 Sep 2026 04:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787

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

Type Values Removed Values Added
Description Internally found bugs present in Firefox 154. 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. Internally found bugs present in Thunderbird 154. 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 Thunderbird 155.
Title Internally found bugs fixed in Firefox 155 Internally found bugs fixed in Thunderbird 155
References

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

Type Values Removed Values Added
Weaknesses CWE-787

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. 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.
Title Internally found bugs fixed in Firefox 155
References

Subscriptions

Mozilla Firefox Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-03T17:23:40.751Z

Reserved: 2026-09-01T07:26:00.760Z

Link: CVE-2026-84142

cve-icon Vulnrichment

Updated: 2026-09-03T17:13:49.305Z

cve-icon NVD

Status : Modified

Published: 2026-09-01T13:20:08.337

Modified: 2026-09-03T18:17:26.900

Link: CVE-2026-84142

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T21:45:09Z

Weaknesses