CVE-2026-18020: IBM i is Affected By Multiple Vulnerabilities in NetServer
Published Aug 12, 2026
·Updated
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to an off-by-one error in bounds checking.
Other sources
IBM i could allow a remote attacker to cause a denial of service due to an off-by-one error in bounds checking.
— IBM
Affected Software
4 affected components
IBM i<=7.6
IBM i<=7.5
IBM i<=7.4
IBM i<=7.3
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
IBM i (Release5770-999)to a version that resolves this vulnerability.Fixed in 7.6Patch MJ10939 - Upgrade
Upgrade
IBM i (Release5770-999)to a version that resolves this vulnerability.Fixed in 7.5Patch MJ10938 - Upgrade
Upgrade
IBM i (Release5770-999)to a version that resolves this vulnerability.Fixed in 7.4Patch MJ10937 - Upgrade
Upgrade
IBM i (Release5770-999)to a version that resolves this vulnerability.Fixed in 7.3Patch MJ10936
Event History
Aug 12, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Aug 13, 2026
CVE Published
via MITRE·08:41 PM
Data Sourced
via MITRE·08:41 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·09:17 PM
DescriptionSeverityWeakness