Use of uninitialized resource in Mozilla products - CVE-2026-117888
Published: October 27, 2026
Vulnerability identifier: #VU158149
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-117888
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially disclose memory contents or disrupt browser operation.
The vulnerability exists due to use of uninitialized memory in the Graphics: Canvas2D component when processing canvas operations. A remote attacker can trigger use of indeterminate memory values through crafted content, potentially exposing residual data or causing incorrect behavior.
Affected software
Firefox ESR
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
How to mitigate CVE-2026-117888
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