{"id":"CVE-2026-103645","kind":"vulnerability","aliases":["CVE-2026-103645"],"related":[],"title":"Qt: integer overflow in text codec conversion, only with ICU builds","description":"An integer overflow vulnerability in the Qt QTextCodec fromUnicode() and toUnicode() functionality of the Qt 5 Core Compatibility APIs module (Qt 6) and the Qt Core module (Qt 5). Only builds where Qt is compiled with ICU support are affected.","summary":"Qt's QTextCodec fromUnicode() and toUnicode() functions contain an integer overflow. Only Qt builds compiled with ICU support are affected.","severity":"low","cvss":1.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["c++","desktop-apps","package","qt"],"not_affected_if":["no-icu-build"],"how_to_check":"- Check whether the Qt build includes ICU support (unknown how to confirm from the sources)\n- Identify the installed Qt version, for example with `qmake --version` (unknown which versions are affected)","fix":null,"status":"open","published_at":"2026-11-13T10:17:24+00:00","first_seen_at":"2026-11-13T10:47:09+00:00","triaged_at":"2026-11-13T10:59:05+00:00","updated_at":"2026-11-13T10:59:05+00:00","category":"package","confidence":0.4,"triage":{"at":"2026-11-13T10:59:05Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"Qt: integer overflow in text codec conversion, only with ICU builds","impact":"low","summary":"Qt's QTextCodec fromUnicode() and toUnicode() functions contain an integer overflow. Only Qt builds compiled with ICU support are affected.","audience":"developers","category":"package","nicknames":[],"who_cares":["qt","c++","desktop-apps"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unknown memory corruption from overflowed size calculation","analyst_note":"Find the Qt advisory and affected/fixed version ranges for CVE-2026-103645 via the NVD link; sources give only the description and a low CVSS 1.1 score.","how_to_check":"- Check whether the Qt build includes ICU support (unknown how to confirm from the sources)\n- Identify the installed Qt version, for example with `qmake --version` (unknown which versions are affected)","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-icu-build"],"who_is_affected":"Applications built on Qt 5 or Qt 6 that are compiled with ICU support are affected, per the description. Builds without ICU are not affected. The sources do not name fixed versions or the exact trigger path.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.000703,"input_tokens":4566,"output_tokens":493,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-103645':14A,17A '-2026':13A,16A '5':59C,72C '6':65C 'affect':43B,83C 'api':62C 'app':21B 'build':11A,37B,74C 'c':18B 'codec':6A 'compat':61C 'compil':38B,78C 'contain':31B 'convers':7A 'core':60C,69C 'cve':12A,15A 'desktop':20B 'desktop-app':19B 'fromunicod':27B,52C 'function':30B,55C 'icu':10A,40B,80C 'integ':2A,33B,45C 'modul':63C,70C 'overflow':3A,34B,46C 'packag':22B 'qt':1A,23B,24B,36B,50C,58C,64C,68C,71C,76C 'qtextcodec':26B,51C 'support':41B,81C 'text':5A 'tounicod':29B,54C 'vulner':47C","nicknames":[],"mitigations":[],"who_affected":"Applications built on Qt 5 or Qt 6 that are compiled with ICU support are affected, per the description. Builds without ICU are not affected. The sources do not name fixed versions or the exact trigger path.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["c","desktopapps","low","package","qt"],"campaign_type":null,"search_a":"'-103645':14A,17A '-2026':13A,16A 'build':11A 'codec':6A 'convers':7A 'cve':12A,15A 'icu':10A 'integ':2A 'overflow':3A 'qt':1A 'text':5A","search_b":"'affect':43B 'app':21B 'build':37B 'c':18B 'compil':38B 'contain':31B 'desktop':20B 'desktop-app':19B 'fromunicod':27B 'function':30B 'icu':40B 'integ':33B 'overflow':34B 'packag':22B 'qt':23B,24B,36B 'qtextcodec':26B 'support':41B 'tounicod':29B","search_c":"'5':59C,72C '6':65C 'affect':83C 'api':62C 'build':74C 'compat':61C 'compil':78C 'core':60C,69C 'fromunicod':52C 'function':55C 'icu':80C 'integ':45C 'modul':63C,70C 'overflow':46C 'qt':50C,58C,64C,68C,71C,76C 'qtextcodec':51C 'support':81C 'tounicod':54C 'vulner':47C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-13T10:17:24+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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:X/U:Clear","cvss_by":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-103645","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103645","severity":null,"published_at":"2026-11-13T10:17:24+00:00","modified_at":"2026-11-13T10:17:24+00:00","first_seen_at":"2026-11-13T10:47:09+00:00","fetched_at":"2026-11-13T10:47:09+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}