CVE-2026-81858 IBM i is Affected By A Denial of Service Vulnerability in Host Servers
A remote authenticated attacker can cause a denial of service and read sensitive information via an out-of-bounds read in the File Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81858?
CVE-2026-81858 is a medium-severity vulnerability in Ibm I, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote authenticated attacker to cause a denial of service and obtain information due to an out-of-bounds read in the File Server.
Weakness: CWE-125
Which versions are affected by CVE-2026-81858?
It affects 1 product.
Products include Ibm I.
How do I fix CVE-2026-81858?
No fix has been published for CVE-2026-81858 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81858 being exploited?
There is no known exploitation of CVE-2026-81858 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-wf64-vjxh-jr77.