CVE-2026-18857 This Power System update is being released to address

Low 3.4 Published 24 Sep 2026 Updated 24 Sep 2026

A vulnerability in IBM OpenBMC firmware allows the host system to crash the BMC service or read internal memory, impacting confidentiality and availability.

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

What is CVE-2026-18857?

CVE-2026-18857 is a low-severity vulnerability in IBM OPENBMC, 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 OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affected by a vulnerability in the BMC firmware management interface. The host system can cause the BMC firmware management service to crash or allow a limited amount of BMC internal memory to be read, resulting in a confidentiality and availability impact to the managed system.

Weakness: CWE-125

Which versions are affected by CVE-2026-18857?

It affects 17 products.

Products include Ibm Power System E1050 \(9043-Mrx\) Firmware, Ibm Power System E1150 \(9043-Mru\) Firmware, Ibm Power System L1022 \(9786-22h\) Firmware, Ibm Power System L1024 \(9786-42h\) Firmware, Ibm Power System L1122 \(9856-22h\) Firmware, Ibm Power System L1124 \(9856-42h\) Firmware and 11 more.

How do I fix CVE-2026-18857?

No fix has been published for CVE-2026-18857 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-18857 being exploited?

There is no known exploitation of CVE-2026-18857 in the wild and no public exploit code.

Sources

Also known as GHSA-34jw-2gcw-f6v2.