What is CVE-2026-18822?

CVE-2026-18822 is a medium-severity vulnerability in IBM Aix, classified under Uncontrolled Resource Consumption. CVSS score: 4.4/10. Published 2026-08-20.

How severe is CVE-2026-18822?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Resource exhaustion in IBM Aix

CVE-2026-18822

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service due to uncontrolled resource consumption when parsing directory records.

Vulnerability class: DoS (Denial of Service)

Published 2026-08-20 · last modified 2026-08-25.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (0.8th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.ibm.com/support/pages/node/7283858 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-18822?: CVE-2026-18822 is a medium-severity vulnerability in IBM Aix, classified under Uncontrolled Resource Consumption. CVSS score: 4.4/10. Published 2026-08-20.
How severe is CVE-2026-18822?: Medium severity. CVSS v3 base score is 4.4 out of 10.