Main Vulnerability Database Vulnerabilities #VU159338

Buffer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-120572

Published: November 4, 2026

Vulnerability identifier: #VU159338

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-120572

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content in the Layout: Block and Inline component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

Mozilla Firefox
Firefox for Android

How to mitigate CVE-2026-120572

Install updates from vendor's website.

Mozilla Firefox - update to 159.0.1
Firefox for Android - update to 159.0.1

External References

Related Security Bulletins