Use of Uninitialized Variable in Mozilla products - CVE-2026-109712
Published: October 16, 2026
Vulnerability identifier: #VU155981
CSH Severity: High
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109712
CWE-ID: CWE-457
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escape the browser sandbox.
The vulnerability exists due to use of uninitialized memory in the Graphics component when processing graphics data. A remote attacker can trigger the use of uninitialized memory during graphics processing to bypass the browser sandbox restrictions.
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-2026-109712
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