🛡️ CVE-2024-39936 — qt

🟠 CVSS 8.6 — High ✅ No Known Exploit CWE-367 NVD
8.6
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An issue was discovered in HTTP2 in Qt before 5.15.18, 6.x before 6.2.13, 6.3.x through 6.5.x before 6.5.7, and 6.6.x through 6.7.x before 6.7.3. Code to make security-relevant decisions about an established connection may execute too early, because the encrypted() signal has not yet been emitted and processed..

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2024-39936 is classified as CWE-367: Time-of-check Time-of-use Race Condition. The state checked and the state acted upon can differ, because it may change between the two steps.

Affected software

CVE-2024-39936 is recorded against 1 package.

  • qt (from 6.6.0 up to 6.7.3)

Timeline and source

Published on 4 July 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

codereview.qt-project.org
codereview.qt-project.org
lists.debian.org

CVE-2024-39936 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.6
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CWE CWE-367
Public Exploit ✅ No
Source NVD
Published 2024-07-04
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
qt 6.6.0 6.7.3

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