CVE-2026-18846

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Buffer Overflow in IBM i Leading to Denial of Service

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 s vulnerable to a buffer overflow from improperly validating client data. By sending malformed requests to one of the host servers, a remote attacker could leverage this vulnerability to cause a denial-of-server (DoS) for that server.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-13

Last Modified

2026-08-13

Generated

2026-08-14

AI Q&A

2026-08-14

EPSS Evaluated

N/A

NVD

CVE-2026-18846

EUVD

EUVD-2026-58239

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-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is a buffer overflow issue in IBM i versions 7.6, 7.5, 7.4, and 7.3. It occurs because the system fails to properly validate client data sent to host servers. Attackers can exploit this by sending malformed requests, causing a denial-of-service (DoS) condition on the affected server.

Impact Analysis

If exploited, this vulnerability could disrupt the availability of IBM i servers by causing them to crash or become unresponsive. This may lead to downtime for services relying on these servers, potentially affecting business operations.

Mitigation Strategies

Apply IBM i PTFs or updates to address the buffer overflow vulnerability. Monitor network traffic for malformed requests targeting host servers. Restrict access to vulnerable servers if possible.

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