CVE-2026-18870 This Power System update is being released to address

Medium 4.3 Published 24 Sep 2026 Updated 24 Sep 2026

A remote attacker can obtain sensitive information from IBM PowerVM Hypervisor due to an out-of-bounds read vulnerability.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-18870?

CVE-2026-18870 is a medium-severity vulnerability in IBM PowerVM Hypervisor, published on 24 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-125

Which versions are affected by CVE-2026-18870?

It affects 26 products.

Products include Ibm Power System E1050 \(9043-Mrx\) Firmware, Ibm Power System E1080 \(9080-Hex\) Firmware, Ibm Power System E1150 \(9043-Mru\) Firmware, Ibm Power System E1180 \(9080-Heu\) Firmware, Ibm Power System E950 \(9040-Mr9\) Firmware, Ibm Power System E980 \(9080-M9s\) Firmware and 20 more.

How do I fix CVE-2026-18870?

No fix has been published for CVE-2026-18870 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-18870 being exploited?

There is no known exploitation of CVE-2026-18870 in the wild and no public exploit code.

Sources

Also known as GHSA-468w-j8gw-m9h2.