Detections
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Linux Distros Unpatched Vulnerability : CVE-2026-93990
high Nessus Plugin ID 348348
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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.- Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.
(CVE-2026-93990)
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-2026-93990
Plugin Details
Severity: High
ID: 348348
File Name: unpatched_CVE_2026_93990.nasl
Version: 1.14
Type: Local
Agent: unix
Family: Misc.
Published: 9/20/2026
Updated: 10/5/2026
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: Medium
Score: 5.8
Percentile: 96.1
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 6.6
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N
CVSS Score Source: CVE-2026-93990
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.9
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.6
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, 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: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:ayttm, p-cpe:/a:canonical:ubuntu_linux:cableswig, p-cpe:/a:canonical:ubuntu_linux:cadaver, p-cpe:/a:canonical:ubuntu_linux:coin3, p-cpe:/a:canonical:ubuntu_linux:expat, p-cpe:/a:canonical:ubuntu_linux:gdcm, p-cpe:/a:canonical:ubuntu_linux:insighttoolkit4, p-cpe:/a:canonical:ubuntu_linux:libxmltok, p-cpe:/a:canonical:ubuntu_linux:matanza, p-cpe:/a:canonical:ubuntu_linux:smart, p-cpe:/a:canonical:ubuntu_linux:swish-e, p-cpe:/a:canonical:ubuntu_linux:tdom, p-cpe:/a:canonical:ubuntu_linux:vnc4, p-cpe:/a:canonical:ubuntu_linux:vtk, p-cpe:/a:canonical:ubuntu_linux:wbxml2, p-cpe:/a:canonical:ubuntu_linux:xmlrpc-c, p-cpe:/a:centos:centos:expat-devel, p-cpe:/a:centos:centos:expat-static, p-cpe:/a:centos:centos:expat, p-cpe:/a:centos:centos:firefox-x11, p-cpe:/a:centos:centos:firefox, p-cpe:/a:centos:centos:mingw-expat, p-cpe:/a:centos:centos:mingw32-expat, p-cpe:/a:centos:centos:mingw64-expat, p-cpe:/a:centos:centos:thunderbird, p-cpe:/a:centos:centos:xmlrpc-c-c%2b%2b, p-cpe:/a:centos:centos:xmlrpc-c-client, p-cpe:/a:centos:centos:xmlrpc-c-client%2b%2b, p-cpe:/a:centos:centos:xmlrpc-c-devel, p-cpe:/a:centos:centos:xmlrpc-c, p-cpe:/a:debian:debian_linux:expat, p-cpe:/a:redhat:enterprise_linux:expat-devel, p-cpe:/a:redhat:enterprise_linux:expat-static, p-cpe:/a:redhat:enterprise_linux:expat, p-cpe:/a:redhat:enterprise_linux:firefox-x11, p-cpe:/a:redhat:enterprise_linux:firefox, p-cpe:/a:redhat:enterprise_linux:mingw-expat, p-cpe:/a:redhat:enterprise_linux:mingw32-expat, p-cpe:/a:redhat:enterprise_linux:mingw64-expat, p-cpe:/a:redhat:enterprise_linux:thunderbird, p-cpe:/a:redhat:enterprise_linux:xmlrpc-c-c%2b%2b, p-cpe:/a:redhat:enterprise_linux:xmlrpc-c-client, p-cpe:/a:redhat:enterprise_linux:xmlrpc-c-client%2b%2b, p-cpe:/a:redhat:enterprise_linux:xmlrpc-c-devel, p-cpe:/a:redhat:enterprise_linux:xmlrpc-c
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: 9/19/2026
Reference Information
CVE: CVE-2026-93990