CVE-2026-94370

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

Published Oct 14, 2026 CVSS 4.0 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

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

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'}

Sources

Status
PUBLISHED
Assigner
Qt
Published
Updated
Oct 14, 2026, 4:02 PM
Reserved
Sep 21, 2026, 11:36 AM
Status
Deferred
Published
Oct 14, 2026, 6:17 AM
Modified
Oct 15, 2026, 3:53 PM
Severity
Important
Public date
Oct 14, 2026, 5:43 AM