CVE-2026-8856 IBM HTTP Server is affected by multiple vulnerabilities

High 7.7 Published 26 May 2026 Updated 27 May 2026

Attackers with write access to server configuration can cause a denial of service in IBM HTTP Server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-8856?

CVE-2026-8856 is a high-severity denial of service vulnerability in IBM HTTP Server, published on 26 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-400

Which versions are affected by CVE-2026-8856?

It affects 1 product.

Products include Ibm Http Server.

How do I fix CVE-2026-8856?

No fix has been published for CVE-2026-8856 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-8856 being exploited?

There is no known exploitation of CVE-2026-8856 in the wild and no public exploit code.

Sources

Also known as GHSA-48g8-mw8p-w6j7.