CVE-2026-11573

Description

A flaw was found in qtbase. Uncontrolled recursion in Qt's QDomDocument serialization (QtXml) allows a remote attacker to provide deeply nested untrusted XML, leading to stack exhaustion. This can cause the application to crash, resulting in a Denial of Service (DoS).

Mitigation

To mitigate this issue, applications that use Qt's QDomDocument for XML serialization should avoid processing untrusted XML input. If processing untrusted XML is unavoidable, implement robust input validation and sanitization to prevent deeply nested structures before passing the data to the QtXml component. This requires application-level changes or careful operational procedures to ensure only trusted XML is processed.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score7.5N/AN/A
Attack VectorNetworkN/AN/A
Attack ComplexityLowN/AN/A
Privileges RequiredNoneN/AN/A
User InteractionNoneN/AN/A
ScopeUnchangedN/AN/A
ConfidentialityNoneN/AN/A
Integrity ImpactNoneN/AN/A
Availability ImpactHighN/AN/A

Vector

Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Understanding the Weakness (CWE)

CWE-776

Availability

Technical Impact: DoS: Resource Consumption (Other)

If parsed, recursive entity references allow the attacker to expand data exponentially, quickly consuming all system resources.

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