Linux Distros Unpatched Vulnerability : CVE-2026-11573

high Nessus Plugin ID 344021

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- Uncontrolled recursion (CWE-674) in the QDomDocument/QDomNode serialization path of the Qt XML module (QtXml, qtbase). QDomElementPrivate::save() and QDomNodePrivate::save() recurse mutually, consuming one stack frame per level of element nesting with no depth limit, no configurable bound and no error return. A document with deeply nested elements parses successfully but exhausts the call stack and terminates the process when serialized. Reachable via QDomDocument::toByteArray() (Qt 4.0 and later), QDomDocument::toString(), QDomDocument::toCString(), QDomNode::save(), and operator<<(QTextStream&, const QDomNode&). Denial of service only no code execution and no memory disclosure. (CVE-2026-11573)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 344021

File Name: unpatched_CVE_2026_11573.nasl

Version: 1.3

Type: Local

Agent: unix

Family: Misc.

Published: 9/9/2026

Updated: 9/22/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-11573

CVSS v3

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 5.7

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.1

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:debian:debian_linux:14.0, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:canonical:ubuntu_linux:qt6-base, p-cpe:/a:canonical:ubuntu_linux:qtbase-opensource-src, p-cpe:/a:debian:debian_linux:qt6-base, p-cpe:/a:debian:debian_linux:qtbase-opensource-src, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-common, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-devel, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-examples, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-gui, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-mysql, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-odbc, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-postgresql, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-private-devel, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-static, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-11573

Detections

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