Amazon Linux 2 : postgresql, --advisory ALAS2-2026-3900 (ALAS-2026-3900)

high Nessus Plugin ID 341853

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of postgresql installed on the remote host is prior to 9.2.24-8. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3900 advisory.

Integer wraparound in PostgreSQL tsvector and tsquery data type functions allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds, via crafted large inputs.
This may execute arbitrary code as the operating system user running the database. These types are typically sourced from application logic, not taken from the application's user. Hence, application users attacking the database, through the application as a conduit, are unlikely. CVE-2026-6473 had fixed similar problems. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.
(CVE-2026-14662)

Heap buffer overflow in PostgreSQL to_char(timestamptz) allows the party choosing the timezone to execute arbitrary code as the operating system user running the database, via a long POSIX timezone abbreviation.
Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. (CVE-2026-14669)

Heap buffer overflow in PostgreSQL plperl return of a tied hash allows the function owner to execute arbitrary code as the operating system user running the database, via a crafted function body. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. (CVE-2026-14670)

Type confusion in PostgreSQL module refint allows an object creator to execute arbitrary code as the operating system user running the database. The fix for this emerged as a non-security bug report, and the fix appear in the git repository with subject refint: Remove plan cache., without a CVE number.
Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. (CVE-2026-14671)

Type confusion with PostgreSQL internal data type arguments allows any user to execute arbitrary code as the operating system user running the database, via calls to functions with that argument type. Type internal represents a class of mutually-incompatible data structures not intended for access from SQL.
The system intended to prevent such function calls, but this prevention had gaps. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. (CVE-2026-14680)

Integer wraparound in PostgreSQL fuzzystrmatch allows a user to direct writes to a huge range of addresses, executing arbitrary code as the operating system user running the database, via extreme inputs to SQL function levenshtein() or levenshtein_less_equal(). Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected. (CVE-2026-15742)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'yum update postgresql' or or 'yum update --advisory ALAS2-2026-3900' to update your system.

Plugin Details

Severity: High

ID: 341853

File Name: al2_ALAS-2026-3900.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 8/31/2026

Updated: 8/31/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2026-15742

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:postgresql-contrib, p-cpe:/a:amazon:linux:postgresql-debuginfo, p-cpe:/a:amazon:linux:postgresql-devel, p-cpe:/a:amazon:linux:postgresql-docs, p-cpe:/a:amazon:linux:postgresql-libs, p-cpe:/a:amazon:linux:postgresql-plperl, p-cpe:/a:amazon:linux:postgresql-plpython, p-cpe:/a:amazon:linux:postgresql-pltcl, p-cpe:/a:amazon:linux:postgresql-server, p-cpe:/a:amazon:linux:postgresql-static, p-cpe:/a:amazon:linux:postgresql-test, p-cpe:/a:amazon:linux:postgresql-upgrade, p-cpe:/a:amazon:linux:postgresql

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/31/2026

Vulnerability Publication Date: 8/13/2026

Reference Information

CVE: CVE-2026-14662, CVE-2026-14669, CVE-2026-14670, CVE-2026-14671, CVE-2026-14680, CVE-2026-15742

IAVB: 2026-B-0238

Detections

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