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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-94370
StatePUBLISHED
AssignerQt
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 06:17:07 UTC
Updated2026-10-14 16:17:57 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 6.5 MEDIUM from a59d8014-47c4-4630-ab43-e1b13cbe58e3

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:N/R:U/V:D/RE:M/U:X

EPSS: 0.003320000 probability, percentile 0.247670000 (date 2026-10-14)

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

VersionSourceTypeScoreSeverityVector
4.0a59d8014-47c4-4630-ab43-e1b13cbe58e3Secondary6.5MEDIUMCVSS: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/C...
4.0CNACVSS6.5MEDIUMCVSS: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...

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
High

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:N/R:U/V:D/RE:M/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Qt Qt For MCUs affected 2.12.1 2.12.3 python Not specified

References

ReferenceSourceLinkTags
wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products a59d8014-47c4-4630-ab43-e1b13cbe58e3 wiki.qt.io
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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