CVE-2026-18151
Received Received - Intake

Race Condition in IBM i WebSocket Handshake Exposes Sensitive Data

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: IBM Corporation

Description
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to obtain sensitive information due to a race condition during the WebSocket handshake process.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-18151
EUVD
EUVD-2026-77765

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
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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Executive Summary

IBM i versions 7.6, 7.5, 7.4, and 7.3 are vulnerable to a race condition during the WebSocket handshake process. This flaw allows a remote authenticated attacker to obtain sensitive information.

Impact Analysis

A remote attacker could exploit this to access sensitive data due to the race condition in WebSocket handshake. The impact includes potential data exposure and unauthorized access to information.

Compliance Impact

This vulnerability could lead to unauthorized data access, potentially violating GDPR (data protection) and HIPAA (health information privacy) by exposing sensitive information.

Mitigation Strategies

Apply IBM i PTFs or updates addressing the race condition in WebSocket handshake. Monitor IBM i security bulletins for patches. Restrict remote authenticated access if possible until patched.

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