CVE-2026-18077: 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 due to a stack-based buffer overflow.

Other sources

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

— IBM

Affected Software

8 affected components
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.

    Patch SJ11061
  2. Upgrade

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

    Patch SJ11123
  3. Upgrade

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

    Patch SJ11127
  4. Upgrade

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

    Patch SJ11129
  5. Upgrade

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

    Patch SJ11131
  6. Upgrade

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

    Patch SJ11084
  7. Upgrade

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

    Patch SJ11083
  8. Upgrade

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

    Patch SJ11074

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·08:41 PM
Data Sourced
via MITRE·08:41 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·09:17 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-18077?

The severity of CVE-2026-18077 is high, rated at 7.5 on the CVSS scale.

2

How do I fix CVE-2026-18077?

To fix CVE-2026-18077, ensure that your IBM i system is updated to the latest version that addresses the vulnerability.

3

What systems are affected by CVE-2026-18077?

CVE-2026-18077 affects IBM i versions 7.6, 7.5, 7.4, and 7.3.

4

What type of vulnerability is CVE-2026-18077?

CVE-2026-18077 is a buffer overflow vulnerability that could lead to a denial of service.

5

What impact does CVE-2026-18077 have on IBM i systems?

CVE-2026-18077 could allow a remote attacker to cause a denial of service, potentially disrupting system availability.

Company

Resources

Contact

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