Integer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-118009
Published: October 27, 2026
Vulnerability identifier: #VU158212
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-2026-118009
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially cause a denial of service or execute arbitrary code.
The vulnerability exists due to integer overflow and use-after-free in Firefox's Graphics: Text component when processing text. A remote attacker can trigger arithmetic errors and access to freed memory to potentially crash the process or corrupt its execution.
Affected software
Mozilla Firefox
Firefox for Android
Firefox for Android
How to mitigate CVE-2026-118009
Install security update from vendor's website.
Mozilla Firefox - update to 159.0
Firefox for Android - update to 159.0
Firefox for Android - update to 159.0