Amazon Linux 2 : libpng, --advisory ALAS2-2026-3266 (ALAS-2026-3266)

medium Nessus Plugin ID 311222

Synopsis

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

Description

The version of libpng installed on the remote host is prior to 1.5.13-8. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3266 advisory.

Use-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST in libpng before 1.6.57. Passing a pointer returned by the corresponding getter back into the setter causes the setter to read from a stale pointer after freeing the internal buffer, leading to corrupted chunk data and potential heap information disclosure. (CVE-2026-34757)

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

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

Solution

Run 'yum update libpng' or or 'yum update --advisory ALAS2-2026-3266' to update your system.

Plugin Details

Severity: Medium

ID: 311222

File Name: al2_ALAS-2026-3266.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/30/2026

Updated: 4/30/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

CVSS v2

Risk Factor: Low

Base Score: 3.6

Temporal Score: 2.7

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

CVSS Score Source: CVE-2026-34757

CVSS v3

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 4.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libpng-devel, p-cpe:/a:amazon:linux:libpng-static, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:libpng-debuginfo, p-cpe:/a:amazon:linux:libpng

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/30/2026

Vulnerability Publication Date: 4/9/2026

Reference Information

CVE: CVE-2026-34757

IAVA: 2026-A-0322

Detections

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