VULNERABILITY INTELLIGENCE

CVE-2026-84142

CVSS score9.8 CRITICAL
EPSS probability0.56%
CISA KEVNot currently listed
Published2026-09-01
Last modified2026-09-03
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • nvd@nist.gov: CWE-119
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-200

Primary references