CVE-2026-16692

Undergoing Analysis Undergoing Analysis - In Progress

Stack-Based Buffer Overflow in IBM i

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 could allow a remote authenticated attacker to cause a denial of service due to a stack-based buffer overflow.

CVSS Scores

EPSS Scores

Probability:
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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-2026-16692

EUVD

EUVD-2026-58365

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	i	7.6
ibm	i	7.5
ibm	i	7.4
ibm	i	7.3
ibm	ibm_i	to 7.4 (exc)
ibm	ibm_i	to 7.5 (exc)
ibm	ibm_i	to 7.6 (exc)
ibm	ibm_i	7.6

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

CVE-2026-16692 is a stack-based buffer overflow vulnerability in IBM i's Simple Mail Transfer Protocol (SMTP). It allows a remote authenticated attacker to cause a denial of service by exploiting an out-of-bounds write issue.

Detection Guidance

Detection involves monitoring for unusual SMTP service behavior or crashes. Check IBM i job logs for SMTP-related errors or stack overflow messages. Use system commands like DSPLOG for QSYSOPR messages or WRKACTJOB to monitor SMTP job (QTSMTP) activity. Network monitoring tools can detect abnormal SMTP traffic patterns targeting IBM i systems.

Impact Analysis

This vulnerability can disrupt the availability of IBM i systems by causing a denial of service. It requires a remote authenticated attacker, meaning an attacker must have valid credentials to exploit it. Confidentiality and integrity are not impacted.

Mitigation Strategies

Apply IBM-provided PTFs immediately: SJ11084/SJ11123 for 7.3, SJ11083/SJ11127 for 7.4, SJ11074/SJ11129 for 7.5, SJ11061/SJ11131 for 7.6.
Restrict remote authenticated access to SMTP services until patched.
Monitor IBM i security bulletins for additional updates or advisories.

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