Heap-based buffer overflow in Oracle VM VirtualBox - CVE-2026-21983
Published: January 20, 2026 / Updated: February 19, 2026
Vulnerability identifier: #VU121766
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21983
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Oracle
Affected software:
Oracle VM VirtualBox
Oracle VM VirtualBox
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the VMSVGA device. A local privileged user can trigger a heap-based buffer overflow and execute arbitrary code on the target system.
How to mitigate CVE-2026-21983
Install updates from vendor's website.