Is CVE-2026-105924 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-105924 being exploited in the wild.

How severe is CVE-2026-105924?

Informational severity, published 30 October 2026.

Which products and versions are affected?

Qt Core 5.12.0 to 6.8.9, 6.9.0 to 6.11.2, 6.12.0.

Is there a fix for CVE-2026-105924?

Yes: fixed in Qt 6.8.10, Qt 6.11.3, Qt 6.12.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-105924 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-105924?

Check whether you run Qt Core at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-105924: Qt Core NULL pointer dereference in CBOR to JSON conversion

CVE-2026-105924 · Severity: info · Published 2026-10-30

Qt is a cross-platform development framework used to build desktop and mobile applications. A NULL pointer dereference vulnerability in the CBOR to JSON conversion feature can crash applications that process untrusted CBOR data, causing denial of service. Depending on compiler optimizations, this could potentially lead to other memory safety issues.

Vendors: Qt.

Quick answers

Is CVE-2026-105924 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-105924 being exploited in the wild.
How severe is CVE-2026-105924?: Informational severity, published 30 October 2026.
Which products and versions are affected?: Qt Core 5.12.0 to 6.8.9, 6.9.0 to 6.11.2, 6.12.0.
Is there a fix for CVE-2026-105924?: Yes: fixed in Qt 6.8.10, Qt 6.11.3, Qt 6.12.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-105924 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-105924?: Check whether you run Qt Core at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Qt 6.8.10, Qt 6.11.3, Qt 6.12.1

Technical details

A NULL pointer dereference occurs in Qt Core's QCborValue to JSON conversion when processing specially crafted CBOR input. The vulnerability affects applications that call QJsonValue, QJsonArray, or QJsonObject conversion functions on untrusted CBOR data decoded via QCborValue. An unauthenticated attacker can trigger a crash via network or file-based input containing the malicious CBOR payload.

Affected products

Qt Qt Core 5.12.0 to 6.8.9, 6.9.0 to 6.11.2, 6.12.0

Timeline

2026-10-30: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.