Detections
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Linux Distros Unpatched Vulnerability : CVE-2026-9499
medium Nessus Plugin ID 329387
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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.- An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL- terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x. (CVE-2026-9499)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2026-9499
Plugin Details
Severity: Medium
ID: 329387
File Name: unpatched_CVE_2026_9499.nasl
Version: 1.5
Type: Local
Agent: unix
Family: Misc.
Published: 7/25/2026
Updated: 9/2/2026
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.3
Percentile: 53.51
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2026-9499
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 6
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 6.3
Threat Score: 1.7
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/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:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:qt6-5compat, p-cpe:/a:canonical:ubuntu_linux:qtbase-opensource-src, p-cpe:/a:centos:centos:qt-assistant, p-cpe:/a:centos:centos:qt-config, p-cpe:/a:centos:centos:qt-demos, p-cpe:/a:centos:centos:qt-devel-private, p-cpe:/a:centos:centos:qt-devel, p-cpe:/a:centos:centos:qt-doc, p-cpe:/a:centos:centos:qt-examples, p-cpe:/a:centos:centos:qt-mysql, p-cpe:/a:centos:centos:qt-odbc, p-cpe:/a:centos:centos:qt-postgresql, p-cpe:/a:centos:centos:qt-qdbusviewer, p-cpe:/a:centos:centos:qt-qvfb, p-cpe:/a:centos:centos:qt-x11, p-cpe:/a:centos:centos:qt5-devel, p-cpe:/a:centos:centos:qt5-rpm-macros, p-cpe:/a:centos:centos:qt5-srpm-macros, p-cpe:/a:centos:centos:qt5, p-cpe:/a:centos:centos:qt6-filesystem, p-cpe:/a:centos:centos:qt6-rpm-macros, p-cpe:/a:centos:centos:qt6-srpm-macros, p-cpe:/a:centos:centos:qt, p-cpe:/a:debian:debian_linux:qt6-5compat, p-cpe:/a:debian:debian_linux:qtbase-opensource-src, p-cpe:/a:redhat:enterprise_linux:qt-assistant, p-cpe:/a:redhat:enterprise_linux:qt-config, p-cpe:/a:redhat:enterprise_linux:qt-demos, p-cpe:/a:redhat:enterprise_linux:qt-devel-private, p-cpe:/a:redhat:enterprise_linux:qt-devel, p-cpe:/a:redhat:enterprise_linux:qt-doc, p-cpe:/a:redhat:enterprise_linux:qt-examples, p-cpe:/a:redhat:enterprise_linux:qt-mysql, p-cpe:/a:redhat:enterprise_linux:qt-odbc, p-cpe:/a:redhat:enterprise_linux:qt-postgresql, p-cpe:/a:redhat:enterprise_linux:qt-qdbusviewer, p-cpe:/a:redhat:enterprise_linux:qt-qvfb, p-cpe:/a:redhat:enterprise_linux:qt-x11, p-cpe:/a:redhat:enterprise_linux:qt5-devel, p-cpe:/a:redhat:enterprise_linux:qt5-rpm-macros, p-cpe:/a:redhat:enterprise_linux:qt5-srpm-macros, p-cpe:/a:redhat:enterprise_linux:qt5, p-cpe:/a:redhat:enterprise_linux:qt6-filesystem, p-cpe:/a:redhat:enterprise_linux:qt6-rpm-macros, p-cpe:/a:redhat:enterprise_linux:qt6-srpm-macros, p-cpe:/a:redhat:enterprise_linux:qt
Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 7/21/2026
Reference Information
CVE: CVE-2026-9499