What is CVE-2026-21956?

CVE-2026-21956 is a high-severity vulnerability in Oracle Vm Virtualbox, classified under Uncontrolled Resource Consumption. CVSS score: 8.2/10. Published 2026-01-20.

How severe is CVE-2026-21956?

High severity. CVSS v3 base score is 8.2 out of 10.

Resource exhaustion in Oracle Vm Virtualbox

CVE-2026-21956

Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core). Supported versions that are affected are 7.1.14 and 7.2.4. Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Oracle VM VirtualBox executes to compromise Oracle VM VirtualBox. While the vulnerability is in Oracle VM VirtualBox, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Oracle VM VirtualBox. CVSS 3.1 Base Score 8.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).

Vulnerability class: DoS (Denial of Service)

EPSS: 0.003 (18.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Oracle Vm_virtualbox — versions 7.1.14, 7.2.4
Oracle Corporation Vm Virtualbox — versions 7.1.14, 7.2.4

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

secalert_us@oracle.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21956?: CVE-2026-21956 is a high-severity vulnerability in Oracle Vm Virtualbox, classified under Uncontrolled Resource Consumption. CVSS score: 8.2/10. Published 2026-01-20.
How severe is CVE-2026-21956?: High severity. CVSS v3 base score is 8.2 out of 10.