CVE-2026-100140 qt CVE debrief

Who should care

Defenders responsible for systems using Qt XML parsing functionality should assess exposure and prioritize verification of affected systems. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

CVE-2026-100140 is a low-severity integer overflow vulnerability in Qt XML parsing functionality. Defenders should assess exposure and prioritize verification of affected systems, focusing on Qt XML parsing functionality usage. The evidence is limited, and further verification is required to determine the affected scope and remediation.

• Verification of affected systems and Qt XML parsing functionality usage
• Potential for low-severity exploitation attempts
• Remediation prioritization for systems using vulnerable Qt versions

Technical summary

The vulnerability is an integer overflow in the Qt XML parsing functionality of Qt. The CVSS score is 1.9, and the severity is low. The CVE record was published on 2026-11-02T12:16:58.910Z and has not been modified since then. The Qt Project is a potential source of the vulnerability. However, the evidence is limited, and further verification is required to determine the affected scope and remediation. Defenders should assess exposure and prioritize verification of affected systems, focusing on Qt XML parsing functionality usage.

Defensive priority

Defenders should assess exposure and prioritize verification of affected systems, focusing on Qt XML parsing functionality usage.

Recommended defensive actions

• Assess exposure and usage of Qt XML parsing functionality
• Verify affected systems and prioritize remediation
• 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 vulnerability is described as an integer overflow in Qt XML parsing functionality. The Qt Project is mentioned as a potential source of the vulnerability. However, the evidence is limited, and further verification is required to determine the affected scope and remediation.

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.