Linux Distros Unpatched Vulnerability : CVE-2026-6475

high Nessus Plugin ID 314711

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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.

- Symlink following in PostgreSQL pg_basebackup plain format and in pg_rewind allows an origin superuser to overwrite local files, e.g. /var/lib/postgres/.bashrc, that hijack the operating system account. It will remain the case that starting the server after these commands implicitly trusts the origin superuser, due to features like shared_preload_libraries. Hence, the attack has practical implications only if one takes relevant action between these commands and server start, like moving the files to a different VM or snapshotting the VM. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
(CVE-2026-6475)

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: 314711

File Name: unpatched_CVE_2026_6475.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 5/14/2026

Updated: 6/3/2026

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: 6.1

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

CVSS Score Source: CVE-2026-6475

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.1

Vector: CVSS:3.0/AV:N/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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:centos:centos:postgresql, p-cpe:/a:centos:centos:postgresql-contrib, p-cpe:/a:centos:centos:postgresql-devel, p-cpe:/a:centos:centos:postgresql-docs, p-cpe:/a:centos:centos:postgresql-jdbc, p-cpe:/a:centos:centos:postgresql-libs, p-cpe:/a:centos:centos:postgresql-server, p-cpe:/a:centos:centos:postgresql-test, p-cpe:/a:centos:centos:postgresql-plperl, p-cpe:/a:centos:centos:postgresql-plpython, p-cpe:/a:centos:centos:postgresql-pltcl, p-cpe:/a:centos:centos:postgresql-upgrade, p-cpe:/a:centos:centos:postgresql-static, p-cpe:/a:centos:centos:postgresql-jdbc-javadoc, p-cpe:/a:redhat:enterprise_linux:postgresql, p-cpe:/a:redhat:enterprise_linux:postgresql-contrib, p-cpe:/a:redhat:enterprise_linux:postgresql-devel, p-cpe:/a:redhat:enterprise_linux:postgresql-docs, p-cpe:/a:redhat:enterprise_linux:postgresql-jdbc, p-cpe:/a:redhat:enterprise_linux:postgresql-libs, p-cpe:/a:redhat:enterprise_linux:postgresql-server, p-cpe:/a:redhat:enterprise_linux:postgresql-test, p-cpe:/a:redhat:enterprise_linux:postgresql-plperl, p-cpe:/a:redhat:enterprise_linux:postgresql-plpython, p-cpe:/a:redhat:enterprise_linux:postgresql-pltcl, p-cpe:/a:redhat:enterprise_linux:postgresql-upgrade, p-cpe:/a:redhat:enterprise_linux:postgresql-plpython3, p-cpe:/a:redhat:enterprise_linux:postgresql-server-devel, p-cpe:/a:redhat:enterprise_linux:postgresql-static, p-cpe:/a:redhat:enterprise_linux:postgresql-test-rpm-macros, p-cpe:/a:redhat:enterprise_linux:postgresql-upgrade-devel, p-cpe:/a:redhat:enterprise_linux:postgresql-jdbc-javadoc, p-cpe:/a:canonical:ubuntu_linux:postgresql-9.3, p-cpe:/a:canonical:ubuntu_linux:postgresql-9.5, p-cpe:/a:canonical:ubuntu_linux:postgresql-10, p-cpe:/a:canonical:ubuntu_linux:postgresql-12, p-cpe:/a:redhat:enterprise_linux:libpq, p-cpe:/a:redhat:enterprise_linux:libpq-devel, p-cpe:/a:redhat:enterprise_linux:pgaudit, p-cpe:/a:redhat:enterprise_linux:postgres-decoderbufs, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:libpq, p-cpe:/a:centos:centos:libpq-devel, p-cpe:/a:centos:centos:postgresql-plpython3, p-cpe:/a:centos:centos:postgresql-server-devel, p-cpe:/a:centos:centos:postgresql-test-rpm-macros, p-cpe:/a:centos:centos:postgresql-upgrade-devel, p-cpe:/a:centos:centos:pgaudit, p-cpe:/a:centos:centos:postgres-decoderbufs, p-cpe:/a:debian:debian_linux:postgresql-13, p-cpe:/a:centos:centos:pg_repack, p-cpe:/a:redhat:enterprise_linux:pg_repack, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:postgresql-private-devel, p-cpe:/a:redhat:enterprise_linux:postgresql-private-libs, p-cpe:/a:centos:centos:postgresql-private-devel, p-cpe:/a:centos:centos:postgresql-private-libs, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:redhat:enterprise_linux:postgresql16, p-cpe:/a:centos:centos:postgresql16, p-cpe:/a:redhat:enterprise_linux:postgresql18, p-cpe:/a:centos:centos:postgresql18, p-cpe:/a:redhat:enterprise_linux:postgresql18-contrib, p-cpe:/a:redhat:enterprise_linux:postgresql18-docs, p-cpe:/a:redhat:enterprise_linux:postgresql18-plperl, p-cpe:/a:redhat:enterprise_linux:postgresql18-plpython3, p-cpe:/a:redhat:enterprise_linux:postgresql18-private-devel, p-cpe:/a:redhat:enterprise_linux:postgresql18-private-libs, p-cpe:/a:redhat:enterprise_linux:postgresql18-server, p-cpe:/a:redhat:enterprise_linux:postgresql18-server-devel, p-cpe:/a:redhat:enterprise_linux:postgresql18-static, p-cpe:/a:redhat:enterprise_linux:postgresql18-test, p-cpe:/a:redhat:enterprise_linux:postgresql18-test-rpm-macros, p-cpe:/a:redhat:enterprise_linux:postgresql18-upgrade, p-cpe:/a:redhat:enterprise_linux:postgresql18-upgrade-devel, p-cpe:/a:centos:centos:postgresql18-contrib, p-cpe:/a:centos:centos:postgresql18-docs, p-cpe:/a:centos:centos:postgresql18-plperl, p-cpe:/a:centos:centos:postgresql18-plpython3, p-cpe:/a:centos:centos:postgresql18-private-devel, p-cpe:/a:centos:centos:postgresql18-private-libs, p-cpe:/a:centos:centos:postgresql18-server, p-cpe:/a:centos:centos:postgresql18-server-devel, p-cpe:/a:centos:centos:postgresql18-static, p-cpe:/a:centos:centos:postgresql18-test, p-cpe:/a:centos:centos:postgresql18-test-rpm-macros, p-cpe:/a:centos:centos:postgresql18-upgrade, p-cpe:/a:centos:centos:postgresql18-upgrade-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: 5/14/2026

Reference Information

CVE: CVE-2026-6475

Detections

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