CVE-2026-17226 in IBM
Summary
by MITRE • 08/14/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to obtain sensitive information or cause a denial of service due to an out-of-bounds read.
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Analysis
by VulDB Data Team • 08/14/2026
This vulnerability affects IBM i operating system versions 7.6, 7.5, 7.4, and 7.3, presenting a critical security risk that could be exploited by remote authenticated attackers. The flaw manifests as an out-of-bounds read condition that occurs when the system processes certain input data structures, potentially allowing unauthorized information disclosure or system disruption. The vulnerability stems from insufficient bounds checking within the system's memory management routines, particularly in how the operating system handles specific data processing operations.
The technical implementation of this vulnerability involves a classic buffer over-read scenario where the IBM i system fails to properly validate array indices or data structure boundaries before accessing memory locations. When authenticated users submit specially crafted input through various system interfaces or network services, the system attempts to read memory beyond allocated buffers, potentially exposing sensitive kernel data, user credentials, or system configuration information. This type of vulnerability falls under CWE-129, which specifically addresses insufficient validation of length of inputs to buffer operations, and represents a fundamental flaw in input sanitization and memory access control mechanisms.
From an operational perspective, the impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks including privilege escalation or denial of service conditions. An attacker with valid credentials could exploit this weakness to extract confidential system information that might reveal network topology, user account details, or internal system architecture. The out-of-bounds read could also trigger system crashes or unpredictable behavior, leading to service disruption that affects business continuity and operational availability. This vulnerability aligns with ATT&CK technique T1059 for command and scripting interpreter usage and T1499 for endpoint denial of service, as it enables both information gathering and system stability compromise.
The remediation approach requires immediate application of IBM's security patches and updates specifically designed to address the buffer validation issues in affected versions. Organizations should implement network segmentation and access controls to limit exposure while waiting for patch deployment, particularly focusing on restricting network access to critical system interfaces. System administrators should also monitor for unusual network activity or system behavior that might indicate exploitation attempts, as the vulnerability may be exploited through various authenticated entry points including remote administration services, database connections, or application programming interfaces. Regular security assessments and input validation reviews should be conducted to prevent similar vulnerabilities in custom applications and third-party integrations that might interact with the vulnerable IBM i components.