What is CVE-2026-9319?

CVE-2026-9319 is a critical-severity vulnerability in Ibm Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 9.0/10. Published 2026-06-01.

How severe is CVE-2026-9319?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Deserialization in Ibm Websphere Application Server

CVE-2026-9319

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to potential remote code execution due to deserialization of untrusted data via JAX-WS endpoints with WS-Security.

Vulnerability class: Insecure Deserialization

EPSS: 0.002 (45.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ibm Websphere Application Server — versions 9.0, 8.5
Ibm Websphere_application_server

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

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

Frequently asked questions

What is CVE-2026-9319?: CVE-2026-9319 is a critical-severity vulnerability in Ibm Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 9.0/10. Published 2026-06-01.
How severe is CVE-2026-9319?: Critical severity. CVSS v3 base score is 9.0 out of 10.