Use-After-Free Vulnerability in Qt's QNetworkAccessManager Affects HTTP/2 Support
CVE-2026-95620

2.1LOW

Key Information:

Vendor

Qt

Status
Qt
Vendor
CVE Published:
23 October 2026

What is CVE-2026-95620?

A use-after-free vulnerability in the Qt QNetworkAccessManager's HTTP/2 client support could allow an attacker to manipulate memory allocations. This exploit enables a malicious HTTP/2 server to craft responses that, when processed by an affected client application, may lead to unexpected crashes. As a result, the availability of the application can be compromised, posing a significant risk to users dependent on reliable network communication.

Affected Version(s)

qt 6.9.0 < 6.11.3

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_pr...
vendor-advisory
https://codereview.qt-project.org/c/qt/qtbase/+/759717
patch

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Daniel Birtwhistle
.