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CVE-2026-84143

Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15 PUBLISHED

Description (CNA)

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. 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 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Affected (CNA)

Vendor / productVersions
Mozilla / Firefoxunaffected 140.15 through 140.*; unaffected 153.2 through 153.*; unaffected 155 through *
Mozilla / Thunderbirdunaffected 140.15 through 140.*; unaffected 153.2 through 153.*; unaffected 155 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.