CVEvulnerability
CVE-2026-84640
7.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-09-01
- Last modified
- 2026-09-03
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-126
Description
A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Affected configurations
• mozilla thunderbird (< 140.15.0)
• mozilla thunderbird (>= 141.0 < 153.2.0)
• mozilla thunderbird (>= 154.0 < 155.0)
Related
Weakness · CWE (1)
- CWE-126 Buffer Over-read weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2063964 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-86/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-87/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-88/ Vendor Advisory