Vulnerability in Qt

[ Description ]Official description

An out-of-bounds read vulnerability in the Qt CoAP message parsing (QCoapInternalReply::createFromFrame()) of the Qt CoAP module. Processing a malformed CoAP message can cause an application using Qt CoAP to crash (loss of availability) or to continue operating on incorrect data (potential loss of integrity).

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund2 Nov 2026WID-SEC-2026-4290

  QT: Vulnerability allows denial of service Translated from German

  CVE-2026-103653

[ References ]References

• codereview.qt-project.org/c/qt/qtcoap/+/760652
• codereview.qt-project.org/c/qt/qtcoap/+/761120
• wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products