Buffer overflow in Mozilla products - CVE-2026-109716
Published: October 16, 2026
Vulnerability identifier: #VU155983
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109716
CWE-ID: CWE-119
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 through improper boundary handling.
The vulnerability exists due to incorrect boundary conditions in the JavaScript Engine component when processing JavaScript. A remote attacker can supply crafted JavaScript that exercises incorrectly handled boundaries to potentially disrupt browser operation.
Affected software
Mozilla Firefox
Firefox ESR
Firefox for Android
Debian Linux
firefox-esr (Debian package)
Firefox ESR
Firefox for Android
Debian Linux
firefox-esr (Debian package)
How to mitigate CVE-2026-109716
Install security update from vendor's website.
Mozilla Firefox - update to 158.0
Firefox for Android - update to 158.0
Firefox ESR - addressed in versions 115.43.0, 153.5.0
firefox-esr (Debian package) - update to 153.5.0esr-1~deb13u1
Firefox for Android - update to 158.0
Firefox ESR - addressed in versions 115.43.0, 153.5.0
firefox-esr (Debian package) - update to 153.5.0esr-1~deb13u1