Vulnerability · Published Aug 19, 2026 · Assigned by ibm

CVE-2026-18871Power System Buffer Overflow

High 7.3

In plain English

A high-severity stack buffer overflow in PowerVM Hypervisor from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.1%top 96.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 is affected by a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the service processor can write specially crafted configuration data, causing the host firmware boot stack to crash with possible memory corruption during system initialisation, resulting in an integrity and availability impact to the managed system.

Affected products (as reported)

Vendor	Product	Versions
IBM	PowerVM Hypervisor	FW1120.00FW1110.00 – through FW1110.30FW1060.00 – through FW1060.80

Weakness: CWE-121 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

References

https://www.ibm.com/support/pages/node/7283238 vendor-advisory, patch