{"id":"CVE-2026-107457","kind":"vulnerability","aliases":["CVE-2026-107457"],"related":[],"title":"Qt MQTT: memory corruption in QMqttClient can crash applications","description":"A memory corruption vulnerability in the QMqttClient class of the Qt MQTT module. Under certain MQTT 5 connection settings between client and server, QMqttClient may corrupt memory, which can cause the application to crash.","summary":"Under certain MQTT 5 connection settings, the Qt MQTT module's QMqttClient class can corrupt memory. The likely result is that the application using it crashes.","severity":"low","cvss":2.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["c++","mqtt","package","qt"],"not_affected_if":["mqtt-3.1.1-only","no-qt-mqtt"],"how_to_check":"- Check whether the application uses the Qt MQTT module (QMqttClient) and which Qt version it links against.\n- Check whether the client connects to an MQTT 5 broker with the settings the advisory describes; the sources do not list them.","fix":null,"status":"open","published_at":"2026-11-02T09:17:36+00:00","first_seen_at":"2026-11-02T09:22:15+00:00","triaged_at":"2026-11-02T09:23:01+00:00","updated_at":"2026-11-02T09:23:01+00:00","category":"package","confidence":0.4,"triage":{"at":"2026-11-02T09:23:01Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Qt MQTT: memory corruption in QMqttClient can crash applications","impact":"low","summary":"Under certain MQTT 5 connection settings, the Qt MQTT module's QMqttClient class can corrupt memory. The likely result is that the application using it crashes.","audience":"developers","category":"package","nicknames":[],"who_cares":["qt","mqtt","c++"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Application crashes due to memory corruption in the MQTT client","analyst_note":"Find the affected Qt versions and the exact MQTT 5 settings from the NVD entry or the Qt advisory.","how_to_check":"- Check whether the application uses the Qt MQTT module (QMqttClient) and which Qt version it links against.\n- Check whether the client connects to an MQTT 5 broker with the settings the advisory describes; the sources do not list them.","plain_action":"","needs_analyst":true,"not_affected_if":["no-qt-mqtt","mqtt-3.1.1-only"],"who_is_affected":"Applications built with the Qt MQTT module that use MQTT 5 connections under certain settings. The sources do not name the exact settings or affected Qt versions. Teams not using Qt MQTT with MQTT 5 are likely unaffected.","user_interaction":"unknown","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.000666,"input_tokens":4092,"output_tokens":513,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-107457':12A,15A '-2026':11A,14A '5':23B,62C 'applic':9A,42B,77C 'c':16B 'caus':75C 'certain':21B,60C 'class':32B,53C 'client':66C 'connect':24B,63C 'corrupt':4A,34B,48C,71C 'crash':8A,45B,79C 'cve':10A,13A 'like':37B 'may':70C 'memori':3A,35B,47C,72C 'modul':29B,58C 'mqtt':2A,17B,22B,28B,57C,61C 'packag':18B 'qmqttclient':6A,31B,52C,69C 'qt':1A,19B,27B,56C 'result':38B 'server':68C 'set':25B,64C 'use':43B 'vulner':49C","nicknames":[],"mitigations":[],"who_affected":"Applications built with the Qt MQTT module that use MQTT 5 connections under certain settings. The sources do not name the exact settings or affected Qt versions. Teams not using Qt MQTT with MQTT 5 are likely unaffected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["c","low","mqtt","package","qt"],"first_public_at":"2026-11-02T09:17:36+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:L/U:Green","cvss_by":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-107457","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107457","severity":null,"published_at":"2026-11-02T09:17:36+00:00","modified_at":"2026-11-02T09:17:36+00:00","first_seen_at":"2026-11-02T09:22:15+00:00","fetched_at":"2026-11-02T09:22:15+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}