CVE-2026-17255 IBM i is Affected By Denial of Service Vulnerability []
Remote attackers can cause a denial of service on IBM i systems by sending malformed ICMPv6 Router Advertisements.
- 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-2026-17255?
CVE-2026-17255 is a medium-severity denial of service vulnerability in Ibm I, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to improper validation of the prefix length in ICMPv6 Router Advertisements.
Weakness: CWE-787
Which versions are affected by CVE-2026-17255?
It affects 1 product.
Products include Ibm I.
How do I fix CVE-2026-17255?
No fix has been published for CVE-2026-17255 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-2026-17255 being exploited?
There is no known exploitation of CVE-2026-17255 in the wild and no public exploit code.
Other vulnerabilities in Ibm I
- CVE-2026-96119 IBM i is Affected By An Improper Control of Code Generation Vulnerability in HTTP Server Administration GUI
- CVE-2026-16860 IBM i is Affected By Remote Code Execution Vulnerability []
- CVE-2026-17083 IBM i is Affected By Multiple Vulnerabilities in the Debug Server
- CVE-2026-17218 IBM i is Affected By Remote Code Execution Vulnerability in Line Printer Daemon []
- CVE-2026-17276 IBM i is Affected By Multiple Vulnerabilities in Navigator for i
Sources
Also known as GHSA-v475-h857-w8m4.