Quick answers
- Is CVE-2025-6338 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-6338 being exploited in the wild.
- How severe is CVE-2025-6338?
- Informational severity, with a CVSS score of 9.2, published 16 October 2025.
- Which products and versions are affected?
- The Qt Company Qt 5.15.0 through 6.8.3, 6.9.0 before 6.9.2.
- Is there a fix for CVE-2025-6338?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2025-6338 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2025-6338?
- Check whether you run The Qt Company Qt 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.
Technical details
An incomplete cleanup vulnerability (CWE-459) exists in the Schannel-based networking implementation of the Qt framework on Windows. The flaw occurs within the Qt Network module, where resources are not properly released during network operations. An attacker can exploit this over a network without authentication to cause a gradual resource leak. Over an extended period, this leads to a Denial of Service (DoS) as system resources are exhausted. The issue affects Qt versions 5.15.0 through 6.8.3 and 6.9.0 before 6.9.2.
Affected products
- The Qt Company Qt 5.15.0 through 6.8.3, 6.9.0 before 6.9.2
Timeline
- 2025-10-16: advisory: Initial disclosure by The Qt Company