CVE-2026-105442 IBM CVE debrief

Who should care

Defenders responsible for WebSphere Application Server and WebSphere Application Server Liberty instances should assess exposure and prioritize patching. Roles responsible for these systems should assess exposure, prioritize patching, and monitor for exploitation attempts. Evidence is limited, and verification of affected versions and remediation is necessary.

Why it matters

Defenders should care about CVE-2026-105442 because it affects IBM WebSphere Application Server and WebSphere Application Server Liberty, potentially allowing remote attackers to cause denial of service. Roles responsible for these systems should assess exposure, prioritize patching, and monitor for exploitation attempts. Evidence is limited, and verification of affected versions and remediation is necessary.

• Denial of service is a supported consequence of exploitation.
• Verification of patching and inventory is a defensive priority.
• Exposure requires verification from official sources.

Technical summary

The vulnerability exists in the messaging service of IBM WebSphere Application Server 8.5, 9.0 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 Liberty. A remote attacker could exploit this vulnerability to cause a denial of service. This is caused by an insecure deserialization in the messaging service. Defenders should prioritize patching affected systems, verifying inventory, and monitoring for potential exploitation attempts. The CVE record and source item provide details on the vulnerability, affected versions, and potential impact.

Defensive priority

Defenders should prioritize patching affected systems, verifying inventory, and monitoring for potential exploitation attempts.

Recommended defensive actions

• Patch affected systems
• Verify inventory of WebSphere Application Server and WebSphere Application Server Liberty instances
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and potential impact. However, there is limited information on exploitation or victim impact. Evidence is limited, and verification of affected versions and remediation is necessary. Defenders should verify patching and inventory from official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.