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

9 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
IBM i=7.3
IBM i=7.4
IBM i=7.5
IBM i=7.6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM i 7.6 to a version that resolves this vulnerability.

    Fixed in 7.6Patch SJ11061
  2. Upgrade

    Upgrade IBM i 7.6 to a version that resolves this vulnerability.

    Fixed in 7.6Patch SJ11123
  3. Upgrade

    Upgrade IBM i 7.6 to a version that resolves this vulnerability.

    Fixed in 7.6Patch SJ11127
  4. Upgrade

    Upgrade IBM i 7.6 to a version that resolves this vulnerability.

    Fixed in 7.6Patch SJ11129
  5. Upgrade

    Upgrade IBM i 7.6 to a version that resolves this vulnerability.

    Fixed in 7.6Patch SJ11131
  6. Upgrade

    Upgrade IBM i 7.5 to a version that resolves this vulnerability.

    Fixed in 7.5Patch SJ11074
  7. Upgrade

    Upgrade IBM i 7.5 to a version that resolves this vulnerability.

    Fixed in 7.5Patch SJ11131
  8. Upgrade

    Upgrade IBM i 7.4 to a version that resolves this vulnerability.

    Fixed in 7.4Patch SJ11083
  9. Upgrade

    Upgrade IBM i 7.3 to a version that resolves this vulnerability.

    Fixed in 7.3Patch SJ11084
  10. Upgrade

    Upgrade IBM i 7.4 to a version that resolves this vulnerability.

    Fixed in 7.4Patch SJ11131
  11. Upgrade

    Upgrade IBM i 7.3 to a version that resolves this vulnerability.

    Fixed in 7.3Patch SJ11129
  12. Upgrade

    Upgrade IBM i 7.5 to a version that resolves this vulnerability.

    Fixed in 7.5Patch SJ11123
  13. Upgrade

    Upgrade IBM i 7.4 to a version that resolves this vulnerability.

    Fixed in 7.4Patch SJ11127
  14. 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
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-16815?

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

2

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.

3

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.

4

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.

5

Can CVE-2026-16815 be exploited remotely?

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

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203