{"id":"CVE-2026-16762","state":"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.","publishedAt":"2026-10-23T08:58:40.028Z","updatedAt":"2026-10-23T10:56:05.830Z","severity":{"score":8.7,"label":"High","version":"4.0","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","source":"Qt"},"assigner":"Qt","products":["qt qt"],"affected":[{"vendor":"qt","product":"qt","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"4.3.0","versionType":"python"},{"version":"4.3.0","status":"affected","lessThan":"6.8.9","versionType":"python"},{"version":"6.9.0","status":"affected","lessThan":"6.11.2","versionType":"python"}],"modules":["qtbase"]}],"references":["https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:","https://codereview.qt-project.org/c/qt/qtbase/+/738885","https://codereview.qt-project.org/c/qt/qtbase/+/738901"],"weaknesses":["CWE-407"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/16xxx/CVE-2026-16762.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16762","state":"PUBLISHED","datePublished":"2026-10-23T08:58:40.028Z","dateUpdated":"2026-10-23T10:56:05.830Z","assignerShortName":"Qt","assignerOrgId":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","dateReserved":"2026-07-23T14:05:09.271Z"},"containers":{"cna":{"title":"Denial-of-service vulnerability in the Qt Core QXmlStream parser (QXmlStreamReader) impacts Qt","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"qt","product":"qt","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"4.3.0","versionType":"python"},{"version":"4.3.0","status":"affected","lessThan":"6.8.9","versionType":"python"},{"version":"6.9.0","status":"affected","lessThan":"6.11.2","versionType":"python"}],"modules":["qtbase"]}],"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"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"PRESENT","Automatable":"YES","Recovery":"AUTOMATIC","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"LOW","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407 Inefficient Algorithmic Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"Qt","orgId":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","dateUpdated":"2026-10-23T08:58:40.028Z"},"impacts":[{"capecId":"CAPEC-229","descriptions":[{"lang":"en","value":"CAPEC-229 Serialized Data Parameter Blowup"}]}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3.0","versionEndExcluding":"6.8.9"},{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9.0","versionEndExcluding":"6.11.2"},{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qtbase:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3.0","versionEndExcluding":"6.8.9"},{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qtbase:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9.0","versionEndExcluding":"6.11.2"}]}]}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-16762","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-23T10:43:53.436456Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-23T10:56:05.830Z"}}]}}}