Vulnerability · Published Sep 4, 2026 · Assigned by ibm
CVE-2026-17255IBM i is Affected By Denial of Service Vulnerability []
Medium 4.3
In plain English
A medium-severity out-of-bounds write in i from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.6%top 49.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://www.ibm.com/support/pages/node/7286093 vendor-advisory, patch