Alpine: postgresql15: security update to 15.18-r0

high Tenable Cloud Security Plugin ID 442205

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

- Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(),
lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack
buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-
length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in
psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. Versions
before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected. (CVE-2026-6477)

- Missing authorization in PostgreSQL CREATE TYPE allows an object creator to hijack other queries that use
search_path to find user-defined types, including extension-defined types. That is to say, the victim will
execute arbitrary SQL functions of the attacker's choice. Versions before PostgreSQL 18.4, 17.10, 16.14,
15.18, and 14.23 are affected. (CVE-2026-6472)

- Integer wraparound in multiple PostgreSQL server features allows an unprivileged database user to cause
the server to undersize an allocation and write out-of-bounds. This may execute arbitrary code as the
operating system user running the database. In applications that pass gigabyte-scale user inputs to the
relevant database functions, the application input provider may achieve a segmentation fault. Versions
before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected. (CVE-2026-6473)

- Externally-controlled format string in PostgreSQL timeofday() function allows an attacker to retrieve
portions of server memory, via crafted timezone zones. Versions before PostgreSQL 18.4, 17.10, 16.14,
15.18, and 14.23 are affected. (CVE-2026-6474)

- 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)

Solution

Update the postgresql15 library and its related packages to version 15.18-r0 or later.

Plugin Details

Severity: High

ID: 442205

Version: Revision 1.2

Type: Local

Family: Alpine Linux Local Security Checks

Published: 5/20/2026

Updated: 5/20/2026

Supported Sensors: Agentless Assessment

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:L/UI:N/S:U/C:H/I:H/A:H

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

CVSS Score Source: CVE-2026-6637

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/14/2026

Reference Information

CVE: CVE-2026-6472, CVE-2026-6473, CVE-2026-6474, CVE-2026-6475, CVE-2026-6477, CVE-2026-6478, CVE-2026-6479, CVE-2026-6637

Detections

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