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RockyLinux 8 : libpq (RLSA-2026:27738)

high Nessus Plugin ID 322389

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Synopsis

The remote RockyLinux host is missing one or more security updates.

Description

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:27738 advisory.

 * postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and pg_rewind (CVE-2026-6475)

 * postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory (CVE-2026-6477)

 * postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison (CVE-2026-6478)

 * postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write (CVE-2026-6473)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://bugzilla.redhat.com/show_bug.cgi?id=2477439

https://bugzilla.redhat.com/show_bug.cgi?id=2477442

https://bugzilla.redhat.com/show_bug.cgi?id=2477447

https://bugzilla.redhat.com/show_bug.cgi?id=2477448

https://errata.rockylinux.org/RLSA-2026:27738

Plugin Details

Severity: High

ID: 322389

File Name: rocky_linux_RLSA-2026-27738.nasl

Version: 1.1

Type: Local

Published: 6/24/2026

Updated: 6/24/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-6477

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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:O/RC:C

Vulnerability Information

CPE: cpe:/o:rocky:linux:8, p-cpe:/a:rocky:linux:libpq, p-cpe:/a:rocky:linux:libpq-debuginfo, p-cpe:/a:rocky:linux:libpq-debugsource, p-cpe:/a:rocky:linux:libpq-devel, p-cpe:/a:rocky:linux:libpq-devel-debuginfo

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RockyLinux/release, Host/RockyLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 6/24/2026

Vulnerability Publication Date: 5/14/2026

Reference Information

CVE: CVE-2026-6473, CVE-2026-6475, CVE-2026-6477, CVE-2026-6478