Linux Distros Unpatched Vulnerability : CVE-2026-34990

medium Nessus Plugin ID 304962

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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.

- OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker- controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer- is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs.
Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches. (CVE-2026-34990)

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: Medium

ID: 304962

File Name: unpatched_CVE_2026_34990.nasl

Version: 1.4

Type: Local

Agent: unix

Family: Misc.

Published: 4/5/2026

Updated: 4/17/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.5

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

CVSS Score Source: CVE-2026-34990

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.4

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:P

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

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:cups-filesystem, p-cpe:/a:redhat:enterprise_linux:cups-printerapp, cpe:/o:debian:debian_linux:12.0, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:cups-ipptool, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:centos:centos:cups-printerapp, p-cpe:/a:redhat:enterprise_linux:cups-lpd, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:cups-lpd, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:cups, p-cpe:/a:centos:centos:cups-filesystem, p-cpe:/a:debian:debian_linux:cups, p-cpe:/a:centos:centos:cups-client, p-cpe:/a:redhat:enterprise_linux:cups-client, p-cpe:/a:centos:centos:cups-devel, p-cpe:/a:redhat:enterprise_linux:cups-libs, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:redhat:enterprise_linux:cups-devel, p-cpe:/a:canonical:ubuntu_linux:cups, p-cpe:/a:centos:centos:cups-libs, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:debian:debian_linux:14.0, p-cpe:/a:centos:centos:cups-ipptool, p-cpe:/a:redhat:enterprise_linux:cups

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

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 4/3/2026

Reference Information

CVE: CVE-2026-34990

Detections

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