What is CVE-2026-17491?

CVE-2026-17491 is a medium-severity vulnerability in IBM I, classified under Improper Privilege Management. CVSS score: 5.4/10. Published 2026-10-16.

How severe is CVE-2026-17491?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Privilege escalation in IBM I

CVE-2026-17491

IBM i 7.3, 7.4, 7.5, and 7.6 is could allow a remote authenticated attacker to bypass security restrictions due to improper enforcement of the ChrootDirectory configuration directive.

Vulnerability class: Privilege Escalation

Published 2026-10-16 · last modified 2026-10-16.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM I — versions 7.3, 7.4, 7.5

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

www.ibm.com/support/pages/node/7292273 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-17491?: CVE-2026-17491 is a medium-severity vulnerability in IBM I, classified under Improper Privilege Management. CVSS score: 5.4/10. Published 2026-10-16.
How severe is CVE-2026-17491?: Medium severity. CVSS v3 base score is 5.4 out of 10.