Resource management error in Qt - CVE-2025-6338
Published: June 30, 2025
Vulnerability identifier: #VU112059
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-6338
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources within the application during Schannel handling. For every connection made a 4KB file is created that is not cleaned up by the application or Qt. A remote attacker initiate multiple TLS connections with the server and perform a denial of service (DoS) attack by consuming all disk space.
Affected software
Qt
How to mitigate CVE-2025-6338
Install updates from vendor's website.
Qt - addressed in versions 6.5.10, 6.8.4, 6.9.2