CVE-2026-94370
Memory corruption (double free / use-after-free) vulnerability in core string handling impacts Qt for MCUs
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.
INFO
Published Date :
Oct. 14, 2026, 6:17 a.m.
Last Modified :
Oct. 14, 2026, 6:17 a.m.
Remotely Exploit :
Yes !
Source :
a59d8014-47c4-4630-ab43-e1b13cbe58e3
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | a59d8014-47c4-4630-ab43-e1b13cbe58e3 | ||||
| CVSS 4.0 | MEDIUM | a59d8014-47c4-4630-ab43-e1b13cbe58e3 |
Solution
- Update Qt for MCUs to a patched version.
- Ensure std::string conversion handles ownership correctly.
- Avoid passing std::string directly to Qul::String.
- Review string handling logic for memory safety.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-94370.
| URL | Resource |
|---|---|
| https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-94370: |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-94370 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-94370
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-94370 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-94370 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by a59d8014-47c4-4630-ab43-e1b13cbe58e3
Oct. 14, 2026
Action Type Old Value New Value 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. Added CVSS V4.0 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 Added CWE CWE-415 Added CWE CWE-416 Added CWE CWE-665 Added CWE CWE-590 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/94xxx/CVE-2026-94370.json">CVE-2026-94370</a> Added Reference https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-94370: