CVE-2026-16815: IBM i is Affected By Multiple Vulnerabilities in Simple Mail Transfer Protocol

Published Aug 12, 2026

Updated

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service and potentially obtain sensitive information due to a stack-based buffer overflow.

Other sources

IBM i could allow a remote attacker to cause a denial of service and potentially obtain sensitive information due to a stack-based buffer overflow.

— IBM

Affected Software

5 affected components

IBM IBM i>=7.3<=7.6

IBM i<=7.6

IBM i<=7.5

IBM i<=7.4

IBM i<=7.3

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade IBM i 7.6 to a version that resolves this vulnerability.
Fixed in 7.6Patch SJ11061
Upgrade
Upgrade IBM i 7.6 to a version that resolves this vulnerability.
Fixed in 7.6Patch SJ11123
Upgrade
Upgrade IBM i 7.6 to a version that resolves this vulnerability.
Fixed in 7.6Patch SJ11127
Upgrade
Upgrade IBM i 7.6 to a version that resolves this vulnerability.
Fixed in 7.6Patch SJ11129
Upgrade
Upgrade IBM i 7.6 to a version that resolves this vulnerability.
Fixed in 7.6Patch SJ11131
Upgrade
Upgrade IBM i 7.5 to a version that resolves this vulnerability.
Fixed in 7.5Patch SJ11074
Upgrade
Upgrade IBM i 7.5 to a version that resolves this vulnerability.
Fixed in 7.5Patch SJ11131
Upgrade
Upgrade IBM i 7.4 to a version that resolves this vulnerability.
Fixed in 7.4Patch SJ11083
Upgrade
Upgrade IBM i 7.3 to a version that resolves this vulnerability.
Fixed in 7.3Patch SJ11084
Upgrade
Upgrade IBM i 7.4 to a version that resolves this vulnerability.
Fixed in 7.4Patch SJ11131
Upgrade
Upgrade IBM i 7.3 to a version that resolves this vulnerability.
Fixed in 7.3Patch SJ11129
Upgrade
Upgrade IBM i 7.5 to a version that resolves this vulnerability.
Fixed in 7.5Patch SJ11123
Upgrade
Upgrade IBM i 7.4 to a version that resolves this vulnerability.
Fixed in 7.4Patch SJ11127
Upgrade
Upgrade IBM i Release5770-TC1 to a version that resolves this vulnerability.
Patch SJ11061

Event History

Aug 12, 2026

CVE Published

via IBM·12:00 AM

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Aug 13, 2026

CVE Published

via MITRE·07:40 PM

Data Sourced

via MITRE·07:40 PM

RemedyDescriptionSeverityWeakness

Data Sourced

via NVD·08:17 PM

DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

IBM-7283291

Frequently Asked Questions

What is the severity of CVE-2026-16815?

CVE-2026-16815 has a severity rating of 8.6, which is classified as high.

How do I fix CVE-2026-16815?

To mitigate CVE-2026-16815, ensure that you apply the latest security updates provided by IBM for IBM i versions 7.3 to 7.6.

What systems are affected by CVE-2026-16815?

IBM i versions 7.3, 7.4, 7.5, and 7.6 are affected by CVE-2026-16815.

What kind of vulnerability is CVE-2026-16815?

CVE-2026-16815 is a stack-based buffer overflow vulnerability that can lead to denial of service and potential information exposure.

Can CVE-2026-16815 be exploited remotely?

Yes, CVE-2026-16815 can be exploited remotely, allowing attackers to cause denial of service.

CVE-2026-16815: IBM i is Affected By Multiple Vulnerabilities in Simple Mail Transfer Protocol

Other sources

Affected Software

Remediation

Event History

Parent advisories

Don't miss critical vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-16815?

How do I fix CVE-2026-16815?

What systems are affected by CVE-2026-16815?

What kind of vulnerability is CVE-2026-16815?

Can CVE-2026-16815 be exploited remotely?

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Frequently Asked Questions

What is the severity of CVE-2026-16815?

How do I fix CVE-2026-16815?

What systems are affected by CVE-2026-16815?

What kind of vulnerability is CVE-2026-16815?

Can CVE-2026-16815 be exploited remotely?