CVE-2026-107457

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{"bugzilla": {"description": "qt: qt: Denial of Service via memory corruption in QMqttClient", "id": "2564735", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2564735"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in Qt. Under certain MQTT version 5 (MQTT 5) connection settings between a client and a server, the QMqttClient class can corrupt memory. A remote attacker could exploit this vulnerability to crash the affected application, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Configure client applications to connect using MQTT protocol version 3.1.1 rather than MQTT 5 where supported by the broker. If MQTT 5 is required, enforce strict broker-side validation to disallow non-standard or malformed session property negotiation."}, "name": "CVE-2026-107457", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "qt5", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "qt6", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-11-02T08:38:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-107457\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-107457\nhttps://codereview.qt-project.org/c/qt/qtmqtt/+/762286\nhttps://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107457:"], "statement": "A memory corruption vulnerability in Qt's QMqttClient class allows a remote attacker to cause an application crash and denial of service by negotiating specific MQTT 5 connection parameters between client and server.", "threat_severity": "Moderate"}

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