CVE-2026-18068 in IBM
Summary
by MITRE • 08/14/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to obtain sensitive information due to a byte-count and element-count confusion.
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Analysis
by VulDB Data Team • 08/14/2026
This vulnerability exists within IBM i operating systems version 7.6, 7.5, 7.4, and 7.3, representing a critical security flaw that enables remote attackers to extract sensitive information through a fundamental confusion between byte-count and element-count parameters. The technical nature of this issue stems from improper validation mechanisms where the system fails to correctly distinguish between these two distinct counting metrics during data processing operations. When an attacker crafts malicious input that exploits this confusion, the system may inadvertently reveal memory contents or internal data structures that should remain protected. This type of vulnerability typically falls under CWE-129, which addresses insufficient validation of length parameters, and can be classified as a buffer over-read condition where the system accesses memory beyond intended boundaries.
The operational impact of this vulnerability extends across multiple attack vectors including network-based exploitation and potential privilege escalation scenarios. Remote attackers can leverage this flaw to gather sensitive system information without requiring local access or elevated privileges, making it particularly dangerous for enterprise environments where IBM i systems handle critical business data. The vulnerability's remote exploitability means that attackers can target these systems from outside the organization's network perimeter, potentially accessing confidential data such as user credentials, system configurations, or proprietary business information. This weakness aligns with ATT&CK technique T1083, which covers discovery of system information, and T1552, covering credentials in files, as attackers could use the leaked information to further compromise the affected systems.
Organizations running these IBM i versions should implement immediate mitigations including applying the latest security patches from IBM, which address the byte-count and element-count confusion through proper input validation mechanisms. Network segmentation strategies can help limit the attack surface by restricting access to critical IBM i systems and implementing strict firewall rules that control inbound connections. Additionally, monitoring systems should be configured to detect anomalous patterns in data processing requests that might indicate exploitation attempts, particularly those involving unusual parameter combinations or memory access patterns. The vulnerability demonstrates the importance of proper input sanitization and validation practices as outlined in OWASP Top Ten category a03, where insufficient input validation leads to information disclosure and other security issues. System administrators should also conduct regular security assessments focusing on data handling routines and implement automated testing procedures that verify correct byte-count versus element-count processing throughout the system's data flow operations.