CVE-2024-39936
qtbase: qtbase: Delay any communication until encrypted() can be responded to
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 4, 2024
Updated · November 21, 2025
Description
A vulnerability was found in Qt where, during a TLS connection for servers supporting HTTP2, Qt may send data to a server even if the TLS certificate doesn't match the redirected address. This occurs because Qt fails to validate the certificate against the redirected address, potentially sending data to an incorrect or malicious server.
Statement
This flaw occurs because Qt does not properly validate the certificate against the redirected address, potentially leading to sensitive data being sent to an unintended or malicious server. Given the potential for significant data exposure, this issue is considered important.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition