Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1963)

high Nessus Plugin ID 328474

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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 ALAS2023-2026-1963 advisory.

When using the configparser module to write configuration filescontaining multi-line text values with carriage return characters (\r) theresulting file could be injected with unexpected keys and values if theattacker controls the written value. (CVE-2026-0864)

tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

When using the tarfile module with a file opened in streaming mode (mode=r|) the tarfile module did not properly handle EOF, making archive parsing take exponentially longer. (CVE-2026-11972)

unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms. (CVE-2026-3276)

bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data. (CVE-2026-9669)

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 python3.9 --releasever 2023.12.20260720' or or 'dnf update --advisory ALAS2023-2026-1963 --releasever 2023.12.20260720' to update your system.

Plugin Details

Severity: High

ID: 328474

File Name: al2023_ALAS2023-2026-1963.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 7/20/2026

Updated: 7/20/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.67

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-3276

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2026-9669

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python-unversioned-command, p-cpe:/a:amazon:linux:python3-debug, p-cpe:/a:amazon:linux:python3-devel, p-cpe:/a:amazon:linux:python3-idle, p-cpe:/a:amazon:linux:python3-libs, p-cpe:/a:amazon:linux:python3-test, p-cpe:/a:amazon:linux:python3-tkinter, p-cpe:/a:amazon:linux:python3.9-debuginfo, p-cpe:/a:amazon:linux:python3.9-debugsource, p-cpe:/a:amazon:linux:python3

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: 6/3/2026

Reference Information

CVE: CVE-2026-0864, CVE-2026-11940, CVE-2026-11972, CVE-2026-3276, CVE-2026-9669

IAVA: 2026-A-0549

Detections

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