Linux Distros Unpatched Vulnerability : CVE-2026-11940

high Nessus Plugin ID 323882

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.

- tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory. This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

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: High

ID: 323882

File Name: unpatched_CVE_2026_11940.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 6/30/2026

Updated: 6/30/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 1.5

Temporal Score: 1.3

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

CVSS Score Source: CVE-2026-11940

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5.1

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

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

CVSS v4

Risk Factor: High

Base Score: 7.8

Threat Score: 4.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:canonical:ubuntu_linux:python3.5, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3.13, p-cpe:/a:debian:debian_linux:pypy3, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:debian:debian_linux:python2.7, p-cpe:/a:debian:debian_linux:python3.14, p-cpe:/a:canonical:ubuntu_linux:python3.4, p-cpe:/a:canonical:ubuntu_linux:python3.10, p-cpe:/a:canonical:ubuntu_linux:python3.14, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:canonical:ubuntu_linux:python3.12, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:debian:debian_linux:python3.9, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3.6, p-cpe:/a:canonical:ubuntu_linux:python3.9, cpe:/o:debian:debian_linux:13.0, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:pypy3, p-cpe:/a:canonical:ubuntu_linux:python3.11, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:debian:debian_linux:python3.11, p-cpe:/a:canonical:ubuntu_linux:python2.7, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3.8, p-cpe:/a:debian:debian_linux:python3.13, p-cpe:/a:canonical:ubuntu_linux:python3.7, 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: 6/23/2026

Reference Information

CVE: CVE-2026-11940

Detections

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