What is CVE-2026-8856?

CVE-2026-8856 is a high-severity vulnerability in Ibm Aix, classified under Uncontrolled Resource Consumption. CVSS score: 7.7/10. Published 2026-05-26.

How severe is CVE-2026-8856?

High severity. CVSS v3 base score is 7.7 out of 10.

Resource exhaustion in Ibm Aix

CVE-2026-8856

IBM HTTP Server 8.5, and 9.0 is vulnerable to denial of service in configurations where an attacker has write access to parts of the server configuration.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/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-400 — Uncontrolled Resource Consumption

References

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

Frequently asked questions

What is CVE-2026-8856?: CVE-2026-8856 is a high-severity vulnerability in Ibm Aix, classified under Uncontrolled Resource Consumption. CVSS score: 7.7/10. Published 2026-05-26.
How severe is CVE-2026-8856?: High severity. CVSS v3 base score is 7.7 out of 10.