CVE-2026-18681 This Power System Buffer Overflow

Medium 6.8 Published 19 Aug 2026 Updated 19 Aug 2026

An authenticated administrator can execute arbitrary code via a buffer overflow in the FSP firmware update process, compromising system integrity.

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-2026-18681?

CVE-2026-18681 is a medium-severity memory corruption vulnerability in IBM Server Firmware, published on 19 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

IBM Server Firmware FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the FSP firmware update process. An attacker with authenticated administrator-level access to the FSP can, under specific conditions, execute arbitrary code, resulting in a confidentiality, integrity, and availability impact.

Weakness: CWE-121

Which versions are affected by CVE-2026-18681?

It affects 9 products.

Products include Ibm Power System E1080 \(9080-Hex\) Firmware, Ibm Power System E1180 \(9080-Heu\) Firmware, Ibm Power System E950 \(9040-Mr9\) Firmware, Ibm Power System E980 \(9080-M9s\) Firmware, Ibm Power System H922 \(9223-22s\) Firmware, Ibm Power System H924 \(9223-42s\) Firmware and 3 more.

How do I fix CVE-2026-18681?

No fix has been published for CVE-2026-18681 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-18681 being exploited?

There is no known exploitation of CVE-2026-18681 in the wild and no public exploit code.

Sources

Also known as GHSA-29hj-6ffg-89rh.