Detections
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Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : libpng vulnerabilities (USN-8251-1)

high Nessus Plugin ID 314216

Synopsis

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

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8251-1 advisory.

 It was discovered that libpng incorrectly handled memory when processing certain PNG files. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code.
 (CVE-2026-33416)

 It was discovered that libpng incorrectly handled expanding 8-bit paletted rows to RGB or RGBA on ARM processors. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33636)

 It was discovered that libpng incorrectly handled certain setter APIs. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-34757)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-8251-1

Plugin Details

Severity: High

ID: 314216

File Name: ubuntu_USN-8251-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/11/2026

Updated: 5/11/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2026-33636

CVSS v3

Risk Factor: High

Base Score: 7.6

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libpng16-16, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libpng-dev, p-cpe:/a:canonical:ubuntu_linux:libpng16-16t64, p-cpe:/a:canonical:ubuntu_linux:libpng-tools, cpe:/o:canonical:ubuntu_linux:25.10

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/7/2026

Vulnerability Publication Date: 3/10/2026

Reference Information

CVE: CVE-2026-33416, CVE-2026-33636, CVE-2026-34757

USN: 8251-1