---
id: CVE-2026-94370
title: A defect in the Qt for MCUs core string handling causes heap memory corruption
summary: >-
  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 t…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-415
  - CWE-416
  - CWE-590
  - CWE-665
  - CWE-1341
vendor: Red Hat
product: Red Hat Enterprise Linux 7
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - hardened_images
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T15:53:08.287'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94370'
references:
  - url: >-
      https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-94370:
    label: a59d8014-47c4-4630-ab43-e1b13cbe58e3
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94370.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94370'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2552092'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94370'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94370'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00332
epssPercentile: 0.26291
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T16:02:10.297104Z'
cvssSource: vendor
scores:
  vendor: 8.1
  cna: 6.5
ingestedAt: '2026-10-14T07:21:04.831Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94370.json)