RCE in Ibm Http Server

CVE-2026-9170

IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service and a potential remote code execution due to improper input validation.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.005 (38.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Http Server — versions 8.5, 9.0
Ibm Http_server — versions 8.5.0.0, 9.0.0.0
Ibm Web Server Plug-ins For Websphere Application And Liberty — versions 8.5, 9.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

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

Frequently asked questions

What is CVE-2026-9170?: CVE-2026-9170 is a critical-severity vulnerability in Ibm Http Server, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-26.
How severe is CVE-2026-9170?: Critical severity. CVSS v3 base score is 9.8 out of 10.