CVE-2026-17220
Undergoing Analysis Undergoing Analysis - In Progress

Buffer Overflow in IBM i Leads to DoS and Authentication Bypass

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: IBM Corporation

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-14
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-17220
EUVD
EUVD-2026-58231

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
ibm i 7.6
ibm i 7.5
ibm i 7.4
ibm i 7.3

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

IBM i versions 7.6, 7.5, 7.4, and 7.3 are vulnerable to a buffer overflow issue. This flaw allows a remote attacker to cause a denial of service and potentially modify authentication metadata.

Impact Analysis

The vulnerability could lead to system crashes due to denial of service and unauthorized changes to authentication settings. This may disrupt services and allow attackers to gain unauthorized access.

Compliance Impact

This vulnerability could lead to unauthorized access or data modification, violating confidentiality and integrity requirements in GDPR and HIPAA. Non-compliance risks include legal penalties and reputational damage.

Mitigation Strategies

Apply the latest IBM i PTFs or updates provided by IBM to address the buffer overflow issue. Monitor IBM's security advisories for patches and test them in a non-production environment before full deployment.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-17220. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart