{"id":"CVE-2026-107479","kind":"vulnerability","aliases":["CVE-2026-107479"],"related":[],"title":"Qt 5: integer truncation in QTextCodec conversion can crash applications","description":"An integer truncation vulnerability in the QTextCodec conversion functions of the Qt 5 Core Compatibility APIs module impacts the Qt Framework. An application using the affected functionality could crash.","summary":"The QTextCodec conversion functions in the Qt 5 Core Compatibility APIs have an integer truncation flaw. An application that uses this functionality can crash.","severity":"low","cvss":1.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["c++","package","qt","qt5"],"not_affected_if":["no-qt5","qtextcodec-unused"],"how_to_check":"- Check whether the application links against Qt 5 Core Compatibility APIs and calls QTextCodec conversion functions.\n- Confirm the installed Qt 5 version with `qmake --version` or the Qt package manager.","fix":null,"status":"open","published_at":"2026-11-04T13:17:21+00:00","first_seen_at":"2026-11-04T13:27:00+00:00","triaged_at":"2026-11-04T13:28:15+00:00","updated_at":"2026-11-04T13:28:15+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-04T13:28:15Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"Qt 5: integer truncation in QTextCodec conversion can crash applications","impact":"low","summary":"The QTextCodec conversion functions in the Qt 5 Core Compatibility APIs have an integer truncation flaw. An application that uses this functionality can crash.","audience":"developers","category":"package","nicknames":[],"who_cares":["qt","qt5","c++"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"application crashes on affected conversion calls","analyst_note":"Find the affected and fixed Qt 5 version ranges in the Qt advisory or NVD entry, and whether input from outside the app can reach the conversion.","how_to_check":"- Check whether the application links against Qt 5 Core Compatibility APIs and calls QTextCodec conversion functions.\n- Confirm the installed Qt 5 version with `qmake --version` or the Qt package manager.","plain_action":"","needs_analyst":true,"not_affected_if":["no-qt5","qtextcodec-unused"],"who_is_affected":"Applications built on Qt 5 that use the QTextCodec conversion functions in the Core Compatibility APIs can crash. The sources do not state which Qt 5 versions are affected or which fixed version to move to. Teams that do not use Qt 5 or that do not call these functions can skip it.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000673,"input_tokens":4097,"output_tokens":526,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-107479':13A,16A '-2026':12A,15A '5':2A,28B,57C 'affect':70C 'api':31B,60C 'applic':10A,38B,67C 'c':17B 'compat':30B,59C 'convers':7A,23B,52C 'core':29B,58C 'could':72C 'crash':9A,44B,73C 'cve':11A,14A 'flaw':36B 'framework':65C 'function':24B,42B,53C,71C 'impact':62C 'integ':3A,34B,46C 'modul':61C 'packag':18B 'qt':1A,19B,27B,56C,64C 'qt5':20B 'qtextcodec':6A,22B,51C 'truncat':4A,35B,47C 'use':40B,68C 'vulner':48C","nicknames":[],"mitigations":[],"who_affected":"Applications built on Qt 5 that use the QTextCodec conversion functions in the Core Compatibility APIs can crash. The sources do not state which Qt 5 versions are affected or which fixed version to move to. Teams that do not use Qt 5 or that do not call these functions can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["c","low","package","qt","qt5"],"campaign_type":null,"first_public_at":"2026-11-04T13:17:21+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/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:X/V:X/RE:L/U:Green","cvss_by":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-107479","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107479","severity":null,"published_at":"2026-11-04T13:17:21+00:00","modified_at":"2026-11-04T13:17:21+00:00","first_seen_at":"2026-11-04T13:27:00+00:00","fetched_at":"2026-11-04T13:27:00+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"}