---
id: "CVE-2026-105924"
kind: "vulnerability"
aliases: ["CVE-2026-105924"]
title: "Qt Core: QCborValue-to-JSON conversion can crash via a NULL pointer dereference"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "desktop-apps", "package", "qt"]
not_affected_if: ["no-cbor-to-json-conversion", "trusted-input-only"]
published_at: "2026-10-30T12:16:34+00:00"
first_seen_at: "2026-10-30T12:30:22+00:00"
updated_at: "2026-10-30T12:34:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105924", "first_seen_at": "2026-10-30T12:30:22+00:00"}]
---

# Qt Core: QCborValue-to-JSON conversion can crash via a NULL pointer dereference

Qt Core's conversion of QCborValue data to JSON dereferences a NULL pointer. An attacker who can supply crafted CBOR input that gets converted can crash the application that runs it.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether an application links against the Qt Core module and calls QCborValue-to-JSON conversion on untrusted input.
- Check the installed Qt version with `qmake --version` or the Qt SDK's version file; the affected version range is unknown.

## Timeline

- 2026-10-30T12:30:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-105924

## From the sources

A NULL pointer dereference vulnerability in the Qt QCborValue to JSON conversion of the Qt Core module.

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