CVE-2026-103500

Published Sep 30, 2026

Last updated 4 days ago

Overview

Description
An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.
Source
security@mozilla.org
NVD status
Modified
Products
thunderbird

Risk scores

CVSS 3.1

Type
Primary
Base score
6.1
Impact score
4.2
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Severity
MEDIUM

Weaknesses

nvd@nist.gov
CWE-787
134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-122

Social media

Hype score
Not currently trending

Configurations