Mozilla · Firefox · CVE-2026-113401
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 158.0.1
Thunderbird versions prior to 158.0.1
**Description**
A denial-of-service issue exists within the PDF Viewer component.
**Recommendations**
Update Firefox to version 158.0.1 or later.
Update Thunderbird to version 158.0.1 or later.