Improper input validation in Oracle VM VirtualBox - CVE-2026-21986
Published: January 20, 2026
Vulnerability identifier: #VU121769
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-21986
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local non-authenticated attacker to a crash the entire system.
The vulnerability exists due to improper input validation within the Core component in Oracle VM VirtualBox. A local non-authenticated attacker can exploit this vulnerability to a crash the entire system.
Affected software
Oracle VM VirtualBox
How to mitigate CVE-2026-21986
Install updates from vendor's website.