Integer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-16389
Published: July 22, 2026
Vulnerability identifier: #VU139009
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-16389
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow in the Libraries component in NSS when processing input. A remote attacker can supply crafted input to cause a denial of service.
The advisory also reports incorrect boundary conditions in the same component.
How to mitigate CVE-2026-16389
Install security update from vendor's website.