What is CVE-2026-16816?

CVE-2026-16816 is a critical-severity vulnerability in IBM Aix, classified under OS Command Injection. CVSS score: 9.9/10. Published 2026-08-19.

How severe is CVE-2026-16816?

Critical severity. CVSS v3 base score is 9.9 out of 10.

RCE in IBM Aix

CVE-2026-16816

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ibm Aix — versions 7.2, 7.3
Ibm Powervm Vios — versions 4.1

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-16816?: CVE-2026-16816 is a critical-severity vulnerability in IBM Aix, classified under OS Command Injection. CVSS score: 9.9/10. Published 2026-08-19.
How severe is CVE-2026-16816?: Critical severity. CVSS v3 base score is 9.9 out of 10.