What is CVE-2026-8855?

CVE-2026-8855 is a high-severity vulnerability in Ibm Aix, classified under Code Injection. CVSS score: 8.1/10. Published 2026-05-26.

How severe is CVE-2026-8855?

High severity. CVSS v3 base score is 8.1 out of 10.

RCE in Ibm Aix

CVE-2026-8855

IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (52.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Aix
Ibm Http Server — versions 8.5.0, 9.0
Ibm Http_server
Ibm Z\/os
Linux Linux_kernel
Microsoft Windows

Weakness classification (CWE)

CWE-94 — Code Injection

References

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

Frequently asked questions

What is CVE-2026-8855?: CVE-2026-8855 is a high-severity vulnerability in Ibm Aix, classified under Code Injection. CVSS score: 8.1/10. Published 2026-05-26.
How severe is CVE-2026-8855?: High severity. CVSS v3 base score is 8.1 out of 10.