{"id":"CVE-2026-94370","aliases":["EUVD-2026-100839","GHSA-vcv3-3vwp-2j63"],"status":"published","title":"Memory corruption (double free / use-after-free) vulnerability in core string handling impacts Qt for MCUs","description":"A defect in the Qt for MCUs core string handling causes heap memory corruption. When an application passes text into Qt Quick Ultralite using the public Qul::String interface type, and that text is held in a std::string, the conversion to the internal string type copies the pointer without taking ownership of it. Two objects then release the same memory, producing a double free, an invalid free, or a use-after-free.","severity":{"version":"4.0","score":6.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/E:U/S:P/AU:N/R:U/V:D/RE:M","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00332,"percentile":0.26771,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-415","CWE-416","CWE-590","CWE-665"],"published":"2026-10-14T05:43:27Z","modified":"2026-10-15T15:53:08Z","products":[{"vendor":"qt","product":"qt_for_mcus"}],"references":[{"url":"https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-94370:","tags":["issue-tracking"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94370"},{"url":"https://github.com/advisories/GHSA-vcv3-3vwp-2j63"}],"sources":{"cve":[{"id":"CVE-2026-94370","title":"Memory corruption (double free / use-after-free) vulnerability in core string handling impacts Qt for MCUs","description":"A defect in the Qt for MCUs core string handling causes heap memory corruption. When an application passes text into Qt Quick Ultralite using the public Qul::String interface type, and that text is held in a std::string, the conversion to the internal string type copies the pointer without taking ownership of it. Two objects then release the same memory, producing a double free, an invalid free, or a use-after-free.","status":"published","published":"2026-10-14T05:43:27.953Z","modified":"2026-10-14T16:02:30.639Z","cvss":[{"version":"4.0","score":6.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/E:U/S:P/AU:N/R:U/V:D/RE:M","level":"medium","assessor":"cna"}],"cwes":["CWE-415","CWE-416","CWE-590","CWE-665"],"updated_at":"2026-11-02T14:19:53.786088Z"}],"euvd":[{"id":"EUVD-2026-100839","description":"A defect in the Qt for MCUs core string handling causes heap memory corruption. When an application passes text into Qt Quick Ultralite using the public Qul::String interface type, and that text is held in a std::string, the conversion to the internal string type copies the pointer without taking ownership of it. Two objects then release the same memory, producing a double free, an invalid free, or a use-after-free.","status":"published","published":"2026-10-14T05:43:27Z","modified":"2026-10-14T16:02:30Z","cvss":[{"version":"4.0","score":6.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/E:U/S:P/AU:N/R:U/V:D/RE:M","level":"medium"}],"updated_at":"2026-11-02T17:27:14.734034Z"}],"ghsa":[{"id":"GHSA-vcv3-3vwp-2j63","title":"A defect in the Qt for MCUs core string handling causes heap memory corruption. When an...","description":"A defect in the Qt for MCUs core string handling causes heap memory corruption. When an application passes text into Qt Quick Ultralite using the public Qul::String interface type, and that text is held in a std::string, the conversion to the internal string type copies the pointer without taking ownership of it. Two objects then release the same memory, producing a double free, an invalid free, or a use-after-free.","status":"published","published":"2026-10-14T06:31:16Z","modified":"2026-10-14T06:31:22Z","cvss":[{"version":"4.0","score":6.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/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:P/AU:N/R:U/V:D/RE:M/U:X","level":"medium"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T15:13:22.867821Z"}],"nvd":[{"id":"CVE-2026-94370","description":"A defect in the Qt for MCUs core string handling causes heap memory corruption. When an application passes text into Qt Quick Ultralite using the public Qul::String interface type, and that text is held in a std::string, the conversion to the internal string type copies the pointer without taking ownership of it. Two objects then release the same memory, producing a double free, an invalid free, or a use-after-free.","status":"published","published":"2026-10-14T06:17:07.07Z","modified":"2026-10-15T15:53:08.287Z","cvss":[{"version":"4.0","score":6.5,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/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:P/AU:N/R:U/V:D/RE:M/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-415","CWE-416","CWE-590","CWE-665"],"updated_at":"2026-11-02T14:12:58.99337Z"}]}}