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CVE-2026-94370

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

MEDIUM
6.5
CVSS Score
Published: October 14, 2026 at 05:43 AM UTC
Updated: October 15, 2026 at 03:53 PM UTC
1 product affected across 1 vendorQt for MCUs

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Issue Tracking
Source: cverecord
https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-94370:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMQt
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-415CWE-416CWE-590CWE-665

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