CVE-2026-16991

HIGH 7.8CVE-2026-16991 · Published 20/08/2026 · updated 27/10/2026

In short

CVE-2026-16991 is a HIGH (CVSS 7.8) vulnerability affecting vios (ibm).
Chance of exploitation in the next 30 days (EPSS): 0.14%, higher than 3.1% of all vulnerabilities.
Fix: update to 4.1.0.50, 4.1.1.30, 4.1.2.20 or later.

Package	Affected versions	Patched versions
vios ibm	`≥ 4.1.0, < 4.1.0.50≥ 4.1.1.0, < 4.1.1.30≥ 4.1.2.0, < 4.1.2.20`	`4.1.0.504.1.1.304.1.2.20`

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to improper handling of symbolic links.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

≥ 4.1.0, < 4.1.0.50≥ 4.1.1.0, < 4.1.1.30≥ 4.1.2.0, < 4.1.2.20

4.1.0.504.1.1.304.1.2.20

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