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.

Project Subscriptions

Vendors Products
Qt For Mcus Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 14 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 14 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1341
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important


Wed, 14 Oct 2026 06:00:00 +0000

Type Values Removed Values Added
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.
Title Memory corruption (double free / use-after-free) vulnerability in core string handling impacts Qt for MCUs
First Time appeared Qt
Qt qt For Mcus
Weaknesses CWE-415
CWE-416
CWE-590
CWE-665
CPEs cpe:2.3:a:qt:qt_for_mcus:*:*:*:*:*:*:*:*
Vendors & Products Qt
Qt qt For Mcus
References
Metrics cvssV4_0

{'score': 6.5, 'vector': '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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Qt

Published:

Updated: 2026-10-14T16:02:30.639Z

Reserved: 2026-09-21T11:36:04.324Z

Link: CVE-2026-94370

cve-icon Vulnrichment

Updated: 2026-10-14T16:02:25.033Z

cve-icon NVD

Status : Received

Published: 2026-10-14T06:17:07.070

Modified: 2026-10-14T16:17:57.707

Link: CVE-2026-94370

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-14T05:43:27Z

Links: CVE-2026-94370 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-14T17:00:04Z