CVE-2026-94370 Memory corruption (double free / use-after-free) vulnerability in core string handling impacts Qt for MCUs
A double free or use-after-free in Qt for MCUs string handling allows attackers to cause memory corruption, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-94370?
CVE-2026-94370 is a medium-severity use after free vulnerability in Qt_for_MCUs, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-94370?
How do I fix CVE-2026-94370?
No fix has been published for CVE-2026-94370 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-94370 being exploited?
There is no known exploitation of CVE-2026-94370 in the wild and no public exploit code.
Sources
Also known as GHSA-vcv3-3vwp-2j63.