CVE-2026-94370

Memory corruption (double free / use-after-free) vulnerability in core string handling impacts Qt for MCUs

State: Published
Severity: 6.5 Medium
Published: Oct 14, 2026
Updated: Oct 14, 2026
Reserved: Sep 21, 2026

Description

A defect in the Qt for MCUs core string handling causes heap memory corruption. When an application passes text into Qt Quick Ultralite using the public Qul::String interface type, and that text is held in a std::string, the conversion to the internal string type copies the pointer without taking ownership of it. Two objects then release the same memory, producing a double free, an invalid free, or a use-after-free.

Scores

CVSS	Score	Vector	Source
4.0	6.5 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/E:U/S:P/AU:N/R:U/V:D/RE:M	Qt

Weaknesses

CWE-415 Double Free
CWE-416 Use After Free
CWE-590 Free of Memory not on the Heap
CWE-665 Improper Initialization

Affected Products

Product	Versions
Qt_for_MCUsqt	2.12.1 to before 2.12.3Affected

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-94370:issue-tracking

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