CVE-2026-18102

Received Received - Intake

Integer Underflow in IBM i Leading to Memory Overwrite

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: IBM Corporation

Description

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to overwrite adjacent memory due to an integer underflow during bounds checking.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-19

Last Modified

2026-08-19

Generated

2026-08-20

AI Q&A

2026-08-20

EPSS Evaluated

N/A

NVD

CVE-2026-18102

EUVD

EUVD-2026-62853

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	i	7.6
ibm	i	7.5
ibm	i	7.4
ibm	i	7.3

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This vulnerability in IBM i 7.6, 7.5, 7.4, and 7.3 allows a remote authenticated attacker to overwrite adjacent memory due to an integer underflow during bounds checking. This could potentially lead to unexpected behavior or crashes in the system.

Impact Analysis

The impact includes potential system instability or crashes due to memory corruption. However, the CVSS score of 3.5 indicates a low severity, suggesting limited direct impact on confidentiality or integrity of data.

Mitigation Strategies

Apply IBM i PTFs or updates for versions 7.6, 7.5, 7.4, and 7.3 to address the integer underflow issue. Monitor IBM PSIRT advisories for patches and restrict remote authenticated access until updates are applied.

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