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CVE-2026-84640

nvd nist
Published: Sep 1, 2026Modified: Sep 3, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploitability: 3.9 / Impact: 3.6
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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 (3)

Products: Mozilla: Thunderbird
Mozilla
1 product
Thunderbird
Configuration A
3 vulnerable
Vulnerable SoftwareAffected Versions
Mozilla
Thunderbird
Before 140.15.0
Thunderbird
From 141.0 to 153.2.0
Thunderbird
From 154.0 to 155.0

Related CWEs

CWE-126
Buffer Over-read
The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

References (4)

Source: security@mozilla.org
Permissions Required
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory

Timeline

No history available yet.