What is CVE-2026-15961?

CVE-2026-15961 is a medium-severity vulnerability in IBM Powervm Hypervisor, classified under Use of Externally-Controlled Format String. CVSS score: 5.2/10. Published 2026-08-19.

How severe is CVE-2026-15961?

Medium severity. CVSS v3 base score is 5.2 out of 10.

Vulnerability in IBM Powervm Hypervisor

CVE-2026-15961

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 IBM PowerVM could allow a local attacker to obtain sensitive information or cause a denial of service due to improper control of format strings.

CVSS v3 metric

CVSS v3 base score 5.2 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H.

Affected products

Ibm Powervm Hypervisor — versions FW1120.00

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-15961?: CVE-2026-15961 is a medium-severity vulnerability in IBM Powervm Hypervisor, classified under Use of Externally-Controlled Format String. CVSS score: 5.2/10. Published 2026-08-19.
How severe is CVE-2026-15961?: Medium severity. CVSS v3 base score is 5.2 out of 10.