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Linux Distros Unpatched Vulnerability : CVE-2026-34078

critical Nessus Plugin ID 305259

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.

 - Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4. (CVE-2026-34078)

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-2026-34078

https://security-tracker.debian.org/tracker/CVE-2026-34078

Plugin Details

Severity: Critical

ID: 305259

File Name: unpatched_CVE_2026_34078.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 4/7/2026

Updated: 4/8/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7.7

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

CVSS Score Source: CVE-2026-34078

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.1

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.1

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:redhat:enterprise_linux:flatpak-session-helper, p-cpe:/a:redhat:enterprise_linux:flatpak-builder, p-cpe:/a:centos:centos:flatpak-session-helper, p-cpe:/a:debian:debian_linux:flatpak, cpe:/o:centos:centos:7, p-cpe:/a:redhat:enterprise_linux:flatpak-libs, cpe:/o:redhat:enterprise_linux:7, cpe:/o:debian:debian_linux:14.0, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:flatpak-builder, p-cpe:/a:centos:centos:flatpak, p-cpe:/a:redhat:enterprise_linux:flatpak, p-cpe:/a:centos:centos:flatpak-devel, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:centos:centos:flatpak-selinux, p-cpe:/a:centos:centos:flatpak-libs, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:flatpak-selinux, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:flatpak-devel

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: 4/7/2026

Reference Information

CVE: CVE-2026-34078