Main Vulnerability Database Vulnerabilities #VU156682

Input validation error in Mozilla Firefox and Firefox for Android - CVE-2026-113401

Published: October 21, 2026

Vulnerability identifier: #VU156682

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-113401

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a denial-of-service weakness in the Firefox PDF Viewer component when processing PDF content. A remote attacker can lure a victim into opening specially crafted PDF content in the browser to disrupt the availability of the PDF viewer.

Affected software

Mozilla Firefox
Firefox for Android

How to mitigate CVE-2026-113401

Install security update from vendor's website.

Mozilla Firefox - update to 158.0.1
Firefox for Android - update to 158.0.1

External References

Related Security Bulletins