CVE-2026-17220: IBM i is Affected By Multiple Vulnerabilities in Host Servers
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service and modify authentication metadata due to a buffer overflow.
Other sources
IBM i could allow a remote attacker to cause a denial of service and modify authentication metadata due to a buffer overflow.
— IBM
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ10848 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ10899 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11022 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11101 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11097 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11098 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11099 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11100 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11102 - Upgrade
Upgrade
IBM i 7.6 (IBM i Release 5770-SS1)to a version that resolves this vulnerability.Fixed in 7.6Patch SJ11103 - Upgrade
Upgrade
IBM i 7.5 (Telnet)to a version that resolves this vulnerability.Fixed in 7.5Patch SJ11102 - Upgrade
Upgrade
IBM i 7.4 (Telnet)to a version that resolves this vulnerability.Fixed in 7.4Patch SJ11103 - Upgrade
Upgrade
IBM i 7.3 (Telnet)to a version that resolves this vulnerability.Fixed in 7.3Patch SJ11104 - Compensating control
If running unsupported versions of affected products, upgrade to a supported and fixed version (IBM recommendation).
Event History
Frequently Asked Questions
What is the severity of CVE-2026-17220?
CVE-2026-17220 has a severity rating of 8.2, indicating a high level of risk.
How does CVE-2026-17220 affect IBM i systems?
CVE-2026-17220 could allow a remote attacker to cause a denial of service and modify authentication metadata due to a buffer overflow.
What versions of IBM i are affected by CVE-2026-17220?
CVE-2026-17220 affects IBM i versions 7.6, 7.5, 7.4, and 7.3.
How can I mitigate the risks associated with CVE-2026-17220?
Mitigation for CVE-2026-17220 requires applying patches or updates provided by IBM for the affected IBM i versions.
What type of vulnerability is CVE-2026-17220 classified as?
CVE-2026-17220 is classified as a buffer overflow vulnerability.