{"id":"CVE-2026-16762","aliases":["AZL-111425","DEBIAN-CVE-2026-16762","EUVD-2026-108655","GHSA-3gxv-qxph-7hg3","UBUNTU-CVE-2026-16762"],"status":"published","title":"Denial-of-service vulnerability in the Qt Core QXmlStream parser (QXmlStreamReader) impacts Qt","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00516,"percentile":0.44403,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-407"],"published":"2026-10-23T08:58:40Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Debian:14","package":"qt6-base","fixed_in":["6.11.2+dfsg-5"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"qtbase","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.3-7"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"qt6-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.10.2+dfsg-1","6.10.2+dfsg-10","6.10.2+dfsg-10+hurd.1","6.10.2+dfsg-11","6.10.2+dfsg-12","6.10.2+dfsg-13","6.10.2+dfsg-14","6.10.2+dfsg-15","6.10.2+dfsg-16","6.10.2+dfsg-2","6.10.2+dfsg-3","6.10.2+dfsg-4","6.10.2+dfsg-5","6.10.2+dfsg-6","6.10.2+dfsg-7","6.10.2+dfsg-7+hurd.1","6.10.2+dfsg-8","6.10.2+dfsg-9","6.11.2+dfsg-1","6.11.2+dfsg-2","6.11.2+dfsg-3","6.11.2+dfsg-4","6.11.2+dfsg-5","6.11.2+dfsg-5+sparc64","6.11.2+dfsg-6","6.4.2+dfsg-10","6.4.2+dfsg-11","6.4.2+dfsg-11~bpo11+1","6.4.2+dfsg-12","6.4.2+dfsg-13","6.4.2+dfsg-14","6.4.2+dfsg-15","6.4.2+dfsg-16","6.4.2+dfsg-17","6.4.2+dfsg-18","6.4.2+dfsg-18+loong64","6.4.2+dfsg-19","6.4.2+dfsg-20","6.4.2+dfsg-21","6.4.2+dfsg-21.1","6.6.0+dfsg-1","6.6.0+dfsg-2","6.6.0+dfsg-3","6.6.0+dfsg-4","6.6.0+dfsg-5","6.6.0+dfsg-6","6.6.1+dfsg-1","6.6.1+dfsg-2","6.6.1+dfsg-3","6.6.1+dfsg-4","6.6.1+dfsg-5","6.6.1+dfsg-6","6.6.2+dfsg-1","6.6.2+dfsg-10","6.6.2+dfsg-11","6.6.2+dfsg-12","6.6.2+dfsg-2","6.6.2+dfsg-3","6.6.2+dfsg-4","6.6.2+dfsg-5","6.6.2+dfsg-6","6.6.2+dfsg-7","6.6.2+dfsg-8","6.6.2+dfsg-9","6.7.2+dfsg-1","6.7.2+dfsg-2","6.7.2+dfsg-3","6.7.2+dfsg-4","6.7.2+dfsg-4+m68k","6.7.2+dfsg-5","6.7.2+dfsg-6","6.8.2+dfsg-1","6.8.2+dfsg-10","6.8.2+dfsg-10.1","6.8.2+dfsg-2","6.8.2+dfsg-3","6.8.2+dfsg-4","6.8.2+dfsg-5","6.8.2+dfsg-5+m68k","6.8.2+dfsg-6","6.8.2+dfsg-7","6.8.2+dfsg-8","6.8.2+dfsg-9","6.9.1+dfsg-1","6.9.1+dfsg-2","6.9.1+dfsg-3","6.9.1+dfsg-4","6.9.1+dfsg-5","6.9.2+dfsg-1","6.9.2+dfsg-2","6.9.2+dfsg-3","6.9.2+dfsg-4"]},{"source":"osv","ecosystem":"Debian:13","package":"qt6-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.10.2+dfsg-1","6.10.2+dfsg-10","6.10.2+dfsg-10+hurd.1","6.10.2+dfsg-11","6.10.2+dfsg-12","6.10.2+dfsg-13","6.10.2+dfsg-14","6.10.2+dfsg-15","6.10.2+dfsg-16","6.10.2+dfsg-2","6.10.2+dfsg-3","6.10.2+dfsg-4","6.10.2+dfsg-5","6.10.2+dfsg-6","6.10.2+dfsg-7","6.10.2+dfsg-7+hurd.1","6.10.2+dfsg-8","6.10.2+dfsg-9","6.11.2+dfsg-1","6.11.2+dfsg-2","6.11.2+dfsg-3","6.11.2+dfsg-4","6.11.2+dfsg-5","6.11.2+dfsg-5+sparc64","6.11.2+dfsg-6","6.8.2+dfsg-10","6.8.2+dfsg-10.1","6.8.2+dfsg-9","6.8.2+dfsg-9+deb13u1","6.8.2+dfsg-9+deb13u2","6.9.1+dfsg-1","6.9.1+dfsg-2","6.9.1+dfsg-3","6.9.1+dfsg-4","6.9.1+dfsg-5","6.9.2+dfsg-1","6.9.2+dfsg-2","6.9.2+dfsg-3","6.9.2+dfsg-4"]},{"source":"osv","ecosystem":"Debian:14","package":"qt6-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.2+dfsg-5"}]}],"versions":["6.10.2+dfsg-1","6.10.2+dfsg-10","6.10.2+dfsg-10+hurd.1","6.10.2+dfsg-11","6.10.2+dfsg-12","6.10.2+dfsg-13","6.10.2+dfsg-14","6.10.2+dfsg-15","6.10.2+dfsg-16","6.10.2+dfsg-2","6.10.2+dfsg-3","6.10.2+dfsg-4","6.10.2+dfsg-5","6.10.2+dfsg-6","6.10.2+dfsg-7","6.10.2+dfsg-7+hurd.1","6.10.2+dfsg-8","6.10.2+dfsg-9","6.11.2+dfsg-1","6.11.2+dfsg-2","6.11.2+dfsg-3","6.11.2+dfsg-4","6.8.2+dfsg-10","6.8.2+dfsg-10.1","6.8.2+dfsg-9","6.9.1+dfsg-1","6.9.1+dfsg-2","6.9.1+dfsg-3","6.9.1+dfsg-4","6.9.1+dfsg-5","6.9.2+dfsg-1","6.9.2+dfsg-2","6.9.2+dfsg-3","6.9.2+dfsg-4"]},{"source":"osv","ecosystem":"Debian:12","package":"qtbase-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.10+dfsg-1","5.15.10+dfsg-2","5.15.10+dfsg-3","5.15.10+dfsg-4","5.15.10+dfsg-5","5.15.10+dfsg-6","5.15.10+dfsg-7","5.15.10+dfsg-7.1","5.15.10+dfsg-7.2","5.15.11+dfsg-1","5.15.12+dfsg-1","5.15.12+dfsg-2","5.15.12+dfsg-3","5.15.13+dfsg-1","5.15.13+dfsg-2","5.15.13+dfsg-3","5.15.13+dfsg-4","5.15.14+dfsg-1","5.15.15+dfsg-1","5.15.15+dfsg-2","5.15.15+dfsg-3","5.15.15+dfsg-4","5.15.15+dfsg-5","5.15.15+dfsg-6","5.15.16+dfsg-1","5.15.16+dfsg-2","5.15.17+dfsg-1","5.15.17+dfsg-2","5.15.17+dfsg-3","5.15.17+dfsg-4","5.15.17+dfsg-5","5.15.17+dfsg-6","5.15.17+dfsg-7","5.15.17+dfsg-8","5.15.18+dfsg-1","5.15.18+dfsg-2","5.15.19+dfsg-1","5.15.19+dfsg-2","5.15.19+dfsg-3","5.15.19+dfsg-4","5.15.19+dfsg-5","5.15.8+dfsg-11","5.15.8+dfsg-11+deb12u1","5.15.8+dfsg-11+deb12u2","5.15.8+dfsg-11+deb12u3","5.15.8+dfsg-12","5.15.8+dfsg-13","5.15.9+dfsg-1","5.15.9+dfsg-2","5.15.9+dfsg-3"]},{"source":"osv","ecosystem":"Debian:13","package":"qtbase-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.15+dfsg-6","5.15.15+dfsg-6+deb13u1","5.15.16+dfsg-1","5.15.16+dfsg-2","5.15.17+dfsg-1","5.15.17+dfsg-2","5.15.17+dfsg-3","5.15.17+dfsg-4","5.15.17+dfsg-5","5.15.17+dfsg-6","5.15.17+dfsg-7","5.15.17+dfsg-8","5.15.18+dfsg-1","5.15.18+dfsg-2","5.15.19+dfsg-1","5.15.19+dfsg-2","5.15.19+dfsg-3","5.15.19+dfsg-4","5.15.19+dfsg-5"]},{"source":"osv","ecosystem":"Debian:14","package":"qtbase-opensource-src","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.15+dfsg-6","5.15.16+dfsg-1","5.15.16+dfsg-2","5.15.17+dfsg-1","5.15.17+dfsg-2","5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company","product":"qt"}],"references":[{"url":"https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:","tags":["vendor-advisory"]},{"url":"https://codereview.qt-project.org/c/qt/qtbase/+/738885","tags":["patch"]},{"url":"https://codereview.qt-project.org/c/qt/qtbase/+/738901","tags":["patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16762","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3gxv-qxph-7hg3"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-16762","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-16762","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-16762","tags":["report"]},{"url":"https://github.com/qt/qtbase/commit/564db12e40089b946c2feaac2a029a0c56e6e588","tags":["report"]},{"url":"https://github.com/qt/qtbase/commit/cd0f0803955a04b9d7e3a24d4e40f8405df2bba8","tags":["report"]},{"url":"https://wiki.qt.io/list_of_known_vulnerabilities_in_qt_products#cve-2026-16762:","tags":["report"]},{"url":"https://security-tracker.debian.org/tracker/cve-2026-16762","tags":["report"]},{"url":"https://advisory.echohq.com/cve/cve-2026-16762","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-16762","title":"Denial-of-service vulnerability in the Qt Core QXmlStream parser (QXmlStreamReader) impacts Qt","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T08:58:40.028Z","modified":"2026-10-23T10:56:05.83Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L","level":"high","assessor":"cna"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:20:10.870108Z"}],"euvd":[{"id":"EUVD-2026-108655","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T08:58:40Z","modified":"2026-10-23T10:56:05Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L","level":"high"}],"updated_at":"2026-11-02T16:59:33.058354Z"}],"ghsa":[{"id":"GHSA-3gxv-qxph-7hg3","title":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can...","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T09:31:23Z","modified":"2026-10-23T09:31:24Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:Y/R:A/V:X/RE:L/U:X","level":"high"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:14:18.846384Z"}],"nvd":[{"id":"CVE-2026-16762","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T09:17:06.647Z","modified":"2026-10-23T19:45:03.547Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:Y/R:A/V:X/RE:L/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:13:02.724605Z"}],"osv":[{"id":"DEBIAN-CVE-2026-16762","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T09:17:06.647Z","modified":"2026-10-24T13:00:07.924813642Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:Y/R:A/V:X/RE:L/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:52.562592Z"},{"id":"UBUNTU-CVE-2026-16762","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T09:17:00Z","modified":"2026-10-28T20:17:19.401292263Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L","level":"high"}],"updated_at":"2026-11-02T16:56:00.592716Z"},{"id":"AZL-111425","title":"CVE-2026-16762 affecting package qtbase 6.6.3-7","description":"An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.","status":"published","published":"2026-10-23T09:17:06Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.705965Z"}]}}