CVE-2026-16762

Denial-of-service vulnerability in the Qt Core QXmlStream parser (QXmlStreamReader) impacts Qt

Published Oct 23, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Denial-of-service vulnerability in the Qt Core QXmlStream parser (QXmlStreamReader) impacts Qt
First Time appeared Qt
Qt qt
Qt qtbase
Weaknesses CWE-407
CPEs cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
cpe:2.3:a:qt:qtbase:*:*:*:*:*:*:*:*
Vendors & Products Qt
Qt qt
Qt qtbase
References
Metrics cvssV4_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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Qt
Published
Updated
Oct 23, 2026, 10:56 AM
Reserved
Jul 23, 2026, 2:05 PM
Status
Awaiting Analysis
Published
Oct 23, 2026, 9:17 AM
Modified
Oct 23, 2026, 7:45 PM