What is CVE-2026-15057?

CVE-2026-15057 is a high-severity vulnerability in IBM Websphere Application Server, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-07-28.

How severe is CVE-2026-15057?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in IBM Websphere Application Server

CVE-2026-15057

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to a denial of service due to uncontrolled heap allocation.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (18.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Ibm Websphere_application_server
Ibm Websphere Application Server - Liberty — versions 17.0.0.3

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-15057?: CVE-2026-15057 is a high-severity vulnerability in IBM Websphere Application Server, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-07-28.
How severe is CVE-2026-15057?: High severity. CVSS v3 base score is 7.5 out of 10.