CVE-2026-113401
Medium
Description
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
SeverityMedium
CVSS6.5
Exploit probability—
ProductFirefox
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- Firefox158.0.1 or later
- Thunderbird158.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox | No range specified | 158.0.1 |
| Thunderbird | No range specified | 158.0.1 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.