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7.5

IBM i TCP Option Handling Denial of Service Risk

CVE-2026-16931 · published 2 months ago
Summary

IBM i versions 7.6, 7.5, 7.4, and 7.3 may be vulnerable to a denial of service attack. This means an attacker could potentially crash the system, disrupting normal operations. IBM recommends upgrading to a fixed version to prevent this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
ibm i 7.6
Original advisory text
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to improper handling of zero-length TCP options.
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to improper handling of zero-length TCP options.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
7.5 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
Timeline
Published12 Aug 2026
Updated4 Nov 2026
First seen12 Aug 2026
Sources
CVE-2026-16931 · NVD
CVE-2026-16931 · MITRE
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