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Amazon Linux 2023 : GraphicsMagick, GraphicsMagick-c++, GraphicsMagick-c++-devel (ALAS2023-2026-1960)

high Nessus Plugin ID 328501

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1960 advisory.

 A flaw was found in GraphicsMagick's Photo CD (PCD) decoder. A remote attacker could exploit this vulnerability by providing a specially crafted PCD file. This could lead to an out-of-bounds write, corrupting memory and potentially causing a denial of service or other unpredictable system behavior.
 (CVE-2026-13606)

 A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer is repositioned only when a sync marker introduces a new plane/row; between sync markers the run length is bounded solely by the input.



 A crafted PCD file that positions the pointer near the end of a plane and then supplies a long run of deltas with no intervening sync therefore walks the pointer past the end of the allocation and writes through it. Processing an untrusted PCD file -- for example with gm convert or gm identify, or through any application linked against libGraphicsMagick -- can corrupt heap memory beyond the buffers.
 (CVE-2026-77118)

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 'dnf update GraphicsMagick --releasever 2023.12.20260720' or or 'dnf update --advisory ALAS2023-2026-1960 --releasever 2023.12.20260720' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1960.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-13606.html

https://explore.alas.aws.amazon.com/CVE-2026-77118.html

Plugin Details

Severity: High

ID: 328501

File Name: al2023_ALAS2023-2026-1960.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 7/20/2026

Updated: 8/28/2026

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: 58.13

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-13606

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

CVSS v4

Risk Factor: High

Base Score: 8.4

Threat Score: 5.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-77118

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:graphicsmagick-c%2b%2b-debuginfo, p-cpe:/a:amazon:linux:graphicsmagick-c%2b%2b-devel, p-cpe:/a:amazon:linux:graphicsmagick-c%2b%2b, p-cpe:/a:amazon:linux:graphicsmagick-debuginfo, p-cpe:/a:amazon:linux:graphicsmagick-debugsource, p-cpe:/a:amazon:linux:graphicsmagick-devel, p-cpe:/a:amazon:linux:graphicsmagick-doc, p-cpe:/a:amazon:linux:graphicsmagick-perl-debuginfo, p-cpe:/a:amazon:linux:graphicsmagick-perl, p-cpe:/a:amazon:linux:graphicsmagick

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/20/2026

Vulnerability Publication Date: 7/20/2026

Reference Information

CVE: CVE-2026-13606, CVE-2026-77118