Detections
Analytics
Linux Distros Unpatched Vulnerability : CVE-2026-11979
low Nessus Plugin ID 323767
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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.- libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in
--shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking. By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame.
Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process. This issue has been fixed in the commit c2e233fc. NOTE: The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug. (CVE-2026-11979)
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-2026-11979
Plugin Details
Severity: Low
ID: 323767
File Name: unpatched_CVE_2026_11979.nasl
Version: 1.5
Type: Local
Agent: unix
Family: Misc.
Published: 6/30/2026
Updated: 7/7/2026
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: High
Score: 7.6
Percentile: 98.44
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 6.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-11979
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 7.1
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
CVSS v4
Risk Factor: Low
Base Score: 1.8
Threat Score: 0.2
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N
Vulnerability Information
CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:redhat:enterprise_linux:podman-gvproxy, p-cpe:/a:redhat:enterprise_linux:python3-libxml2, p-cpe:/a:redhat:enterprise_linux:podman-manpages, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:centos:centos:podman, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:podman-remote, p-cpe:/a:redhat:enterprise_linux:podman, p-cpe:/a:redhat:enterprise_linux:podman-catatonit, p-cpe:/a:centos:centos:podman-remote, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:centos:centos:podman-manpages, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:libxml2-devel, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:centos:centos:podman-catatonit, p-cpe:/a:redhat:enterprise_linux:podman-plugins, p-cpe:/a:redhat:enterprise_linux:podman-tests, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:python3-libxml2, p-cpe:/a:debian:debian_linux:libxml2, p-cpe:/a:centos:centos:libxml2-static, p-cpe:/a:centos:centos:podman-docker, p-cpe:/a:centos:centos:podman-gvproxy, p-cpe:/a:centos:centos:podman-plugins, p-cpe:/a:redhat:enterprise_linux:podman-docker, cpe:/o:redhat:enterprise_linux:8, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:redhat:enterprise_linux:libxml2-static, p-cpe:/a:canonical:ubuntu_linux:libxml2, p-cpe:/a:redhat:enterprise_linux:libxml2-python, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:libxml2, p-cpe:/a:centos:centos:podman-tests, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:libxml2-devel, p-cpe:/a:centos:centos:libxml2-python, p-cpe:/a:redhat:enterprise_linux:libxml2, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:debian:debian_linux:14.0
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: 6/29/2026
Reference Information
CVE: CVE-2026-11979