CVE-2026-94370 qt CVE debrief

Who should care

Defenders responsible for Qt for MCUs deployments should assess exposure and verify affected versions in their inventory. This vulnerability has a medium CVSS score of 6.5 and may require prioritized remediation.

Why it matters

A memory corruption vulnerability in Qt for MCUs' core string handling can lead to double free or use-after-free issues, potentially impacting system stability and security.

• Verify affected versions of Qt for MCUs in your inventory to assess exposure
• Monitor for potential exploitation attempts to detect possible attacks
• Remediate vulnerable versions to prevent potential memory corruption issues

Technical summary

The vulnerability occurs when text is passed into Qt Quick Ultralite using the Qul::String interface type, causing a double free or use-after-free issue. This happens when the text is held in a std::string and converted to the internal string type, leading to two objects releasing the same memory. The vulnerability has a medium CVSS score of 6.5. Defenders should prioritize verifying affected versions and assessing exposure in their inventory, as the vulnerability may require prioritized remediation. The Qt vendor has a wiki page listing known vulnerabilities, including this CVE.

Defensive priority

Defenders should prioritize verifying affected versions and assessing exposure in their inventory, as the vulnerability has a medium CVSS score of 6.5.

Recommended defensive actions

• Verify affected versions of Qt for MCUs in your inventory
• Assess exposure to the vulnerability in your systems
• 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, but limited information is available on affected versions and remediation. The Qt vendor has a wiki page listing known vulnerabilities, including this CVE.

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.