What is CVE-2026-18870?

CVE-2026-18870 is a medium-severity vulnerability in IBM Powervm Hypervisor, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2026-09-24.

How severe is CVE-2026-18870?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Out-of-bounds Read in IBM Powervm Hypervisor

CVE-2026-18870

IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3 could allow a remote attacker to obtain sensitive information due to an out-of-bounds read.

Vulnerability class: Buffer Overflow

Published 2026-09-24 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 Powervm Hypervisor

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

www.ibm.com/support/pages/node/7289135 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-18870?: CVE-2026-18870 is a medium-severity vulnerability in IBM Powervm Hypervisor, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2026-09-24.
How severe is CVE-2026-18870?: Medium severity. CVSS v3 base score is 4.3 out of 10.