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Linux Distros Unpatched Vulnerability : CVE-2026-56860

medium Nessus Plugin ID 335367

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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.

 - Previously, resolving relative paths containing parent directory ('..') segments performed string conversions and buffer rewrites on each step, resulting in quadratic time complexity and high memory allocation overhead. Now, path resolution operates on a byte buffer using index-based backtracking for '..' segments, eliminating the quadratic time complexity and significantly reducing memory allocations.
 (CVE-2026-56860)

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-2026-56860

https://security-tracker.debian.org/tracker/CVE-2026-56860

https://ubuntu.com/security/CVE-2026-56860

Plugin Details

Severity: Medium

ID: 335367

File Name: unpatched_CVE_2026_56860.nasl

Version: 1.28

Type: Local

Agent: unix

Family: Misc.

Published: 8/14/2026

Updated: 9/24/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.65

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-56860

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.4

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

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

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:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:debian:debian_linux:14.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:golang-1.10, p-cpe:/a:canonical:ubuntu_linux:golang-1.13, p-cpe:/a:canonical:ubuntu_linux:golang-1.14, p-cpe:/a:canonical:ubuntu_linux:golang-1.16, p-cpe:/a:canonical:ubuntu_linux:golang-1.17, p-cpe:/a:canonical:ubuntu_linux:golang-1.18, p-cpe:/a:canonical:ubuntu_linux:golang-1.20, p-cpe:/a:canonical:ubuntu_linux:golang-1.21, p-cpe:/a:canonical:ubuntu_linux:golang-1.22, p-cpe:/a:canonical:ubuntu_linux:golang-1.23, p-cpe:/a:canonical:ubuntu_linux:golang-1.24, p-cpe:/a:canonical:ubuntu_linux:golang-1.25, p-cpe:/a:canonical:ubuntu_linux:golang-1.6, p-cpe:/a:canonical:ubuntu_linux:golang-1.8, p-cpe:/a:canonical:ubuntu_linux:golang-1.9, p-cpe:/a:centos:centos:butane, p-cpe:/a:centos:centos:delve, p-cpe:/a:centos:centos:go-filesystem, p-cpe:/a:centos:centos:go-rpm-macros, p-cpe:/a:centos:centos:go-rpm-templates, p-cpe:/a:centos:centos:go-srpm-macros, p-cpe:/a:centos:centos:gvisor-tap-vsock-gvforwarder, p-cpe:/a:centos:centos:gvisor-tap-vsock, p-cpe:/a:centos:centos:host-metering-selinux, p-cpe:/a:centos:centos:host-metering, p-cpe:/a:centos:centos:ignition-edge, p-cpe:/a:centos:centos:ignition-grub, p-cpe:/a:centos:centos:ignition-validate, p-cpe:/a:centos:centos:ignition, p-cpe:/a:centos:centos:oci-delta, p-cpe:/a:centos:centos:rhc, p-cpe:/a:debian:debian_linux:golang-1.19, p-cpe:/a:debian:debian_linux:golang-1.24, p-cpe:/a:debian:debian_linux:golang-1.25, p-cpe:/a:redhat:enterprise_linux:butane, p-cpe:/a:redhat:enterprise_linux:delve, p-cpe:/a:redhat:enterprise_linux:go-filesystem, p-cpe:/a:redhat:enterprise_linux:go-rpm-macros, p-cpe:/a:redhat:enterprise_linux:go-rpm-templates, p-cpe:/a:redhat:enterprise_linux:go-srpm-macros, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock-gvforwarder, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock, p-cpe:/a:redhat:enterprise_linux:host-metering-selinux, p-cpe:/a:redhat:enterprise_linux:host-metering, p-cpe:/a:redhat:enterprise_linux:ignition-edge, p-cpe:/a:redhat:enterprise_linux:ignition-grub, p-cpe:/a:redhat:enterprise_linux:ignition-validate, p-cpe:/a:redhat:enterprise_linux:ignition, p-cpe:/a:redhat:enterprise_linux:oci-delta, p-cpe:/a:redhat:enterprise_linux:rhc

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/13/2026

Reference Information

CVE: CVE-2026-56860