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AlmaLinux 9.6 [TuxCare] Security Update: libpng15 (ALMALINUX9.6:CLSA-2026:1779127797)

medium Nessus Plugin ID 352798

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Synopsis

The AlmaLinux host is missing one or more security updates.

Description

The AlmaLinux 9.6 host has a package installed that is affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1779127797 advisory.

 - LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57. (CVE-2026-34757)

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

Solution

Update the affected libpng15 package based on the guidance in TuxCare advisory ALMALINUX9.6:CLSA-2026:1779127797.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1779127797

http://www.nessus.org/u?83f8312d

Plugin Details

Severity: Medium

ID: 352798

File Name: tuxcare_alma_linux_9.6_CLSA-2026-1779127797.nasl

Version: 1.1

Type: Local

Published: 9/30/2026

Updated: 9/30/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.1

Percentile: 53.55

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Low

Base Score: 3.2

Temporal Score: 2.5

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

CVSS Score Source: CVE-2026-34757

CVSS v3

Risk Factor: Medium

Base Score: 4.4

Temporal Score: 4

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

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

Vulnerability Information

Required KB Items: Host/OS/extended-third-party, Host/local_checks_enabled, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/18/2026

Vulnerability Publication Date: 4/9/2026

Reference Information

CVE: CVE-2026-34757

CLSA: 2026:1779127797