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Amazon Linux 2023 : python3-pillow, python3-pillow-devel, python3-pillow-tk (ALAS2023-2026-3441)
high Nessus Plugin ID 379823
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3441 advisory.A flaw was found in Pillow. When parsing GIF images with numerous comment blocks, the library repeatedly copies data in an inefficient manner. A remote attacker can exploit this vulnerability by submitting a specially crafted GIF image to an application that processes images using Pillow, causing excessive CPU consumption and leading to a Denial of Service (DoS). (CVE-2026-112401)
A flaw was found in Pillow. When saving an image in the TIFF format, Pillow incorrectly forwards unknown metadata tags to the underlying image processing library. A remote attacker could exploit this flaw by providing a specially crafted image containing malicious metadata to an application that processes and re- saves it. Successful exploitation allows the attacker to read out-of-bounds memory, leading to the disclosure of sensitive process memory or causing the application to crash, resulting in a Denial of Service (DoS). (CVE-2026-112902)
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, PdfParser.linearize_page_tree() in src/PIL/PdfParser.py treats a PDF /Pages graph as a tree without tracking duplicate indirect references.
When Image.save(..., format=PDF, append=True) processes an attacker-controlled existing PDF whose /Kids arrays repeatedly reference the same child /Pages node, Pillow expands the shared subtree as distinct pages. A compact malformed PDF can therefore create exponentially many page references and consume disproportionate CPU before the append completes. This issue is fixed in version 13.0.0. (CVE-2026-96640)
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 python-pillow --releasever 2023.12.20261112' or or 'dnf update --advisory ALAS2023-2026-3441 --releasever 2023.12.20261112' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3441.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-112401.html
Plugin Details
Severity: High
ID: 379823
File Name: al2023_ALAS2023-2026-3441.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 11/12/2026
Updated: 11/12/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.3
Percentile: 53.52
CVSS v2
Risk Factor: High
Base Score: 9.4
Temporal Score: 7.4
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C
CVSS Score Source: CVE-2026-112902
CVSS v3
Risk Factor: Critical
Base Score: 9.1
Temporal Score: 8.2
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.3
Threat Score: 7
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python-pillow-debuginfo, p-cpe:/a:amazon:linux:python-pillow-debugsource, p-cpe:/a:amazon:linux:python3-pillow-debuginfo, p-cpe:/a:amazon:linux:python3-pillow-devel, p-cpe:/a:amazon:linux:python3-pillow-tk-debuginfo, p-cpe:/a:amazon:linux:python3-pillow-tk, p-cpe:/a:amazon:linux:python3-pillow
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: 11/12/2026
Vulnerability Publication Date: 10/19/2026