Integer overflow in Mozilla products - CVE-2026-117993
Published: October 27, 2026
Vulnerability identifier: #VU158197
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-2026-117993
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially disrupt browser operation through incorrect integer calculations.
The vulnerability exists due to integer overflow in the Graphics: Text component when calculating values for text processing. A remote attacker can supply crafted content to exceed an integer's representable range, potentially causing incorrect calculations or browser instability.
Affected software
Firefox ESR
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
How to mitigate CVE-2026-117993
Install security update from vendor's website.
Firefox ESR - update to 153.6.0
Firefox for Android - update to 159.0
Mozilla Firefox - update to 159.0
Firefox for Android - update to 159.0
Mozilla Firefox - update to 159.0